Lightroom: Very very slow

  • 3
  • Problem
  • Updated 2 years ago
  • (Edited)
I am a wedding photographer. I use one catalog for every wedding (1000-4000 pictures).
When i start editing the pictures, lightroom is not very fast....but when i work a while...it is so slooooww. It takes many seconds, to switch a picture or cut it. This is very bad, time is money....

I have Win 7 / 16 GB Ram / AMD Radeon 700 200er series graphic card / AMD FX 8350 Eight-Core Processor.

Where is the problem? Is there anything i can do?

Thank you so much!!!!
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Tim Paletzki

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Posted 2 years ago

  • 3
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Assaf Frank

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I have the same problems and I'm looking to move to Capture One.
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Tim Paletzki

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Capture one is not my favorite
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Assaf Frank

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I know they need to improve their workflow and UI, but in terms of speed and raw processing they take LR for a ride.
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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If you go to Preferences > Performance... and uncheck "Use Graphics Processor" then restart LR, does the performance of moving between images improve?
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Tim Paletzki

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I did it and i think i is just a little little bit faster, to change the pictures. But the other functions are slow. Should the "Use graphics Processor" button everytime be unchecked ?
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Assaf Frank

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if you do spot removal or use the local adjustment brush you need to uncheck it otherwise it could be very slow. for sliders it needs to be checked.
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Tim Paletzki

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Sliders like sharpness, lights etc...?
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Assaf Frank

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yes Exposure, WB, white etc,  not sure about sharpening,

I also noticed that if you do lens correction it slows everything so try and do in the end but be aware that if you do spot removal before the lens correction the circles may not match exactly after the lens correction as it distorts the image and the mapping on the circles doesn't change.
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Diko

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This is some great observation. I personally am talking about that particular slow down for ages.

Those particular functions don't utilize the GPU at all. On the other hand the 4 cores (8 threads) of my 6770k @4.6 Ghz are totally busy. And it is still too slow. And the bug witht the GPU does not affect my system. Both checked and unchecked it's the same regardless if Pics are on SSD in DNG and in small catalogs.
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Ken Rounds

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What version are you using? They improved things in the recent 6.1 update.
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Assaf Frank

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are you using 4K Display?
what type of raw files you have?
how many MP?
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Tim Paletzki

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No 4k, RAW Files Nikon D810
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Assaf Frank

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try to restart lightroom after working on 10 images or so, this will improve the performance.
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Tim Paletzki

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stopping after every 10 pictures? by the way i have more than 1000 -> 100 restarts?????
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Assaf Frank

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yes, that is lightroom, welcome to the club.

for me performance are better after restart, give it ago and see if things are faster just after restart.
(Edited)
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Tim, It may help if we could see your Lightroom System Info. Launch Lightroom, and select Help > System Info... and copy/paste the text in a reply.
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Tim Paletzki

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Version von Lightroom: CC 2015.6.1 [ 1083169 ]
Lizenz: Creative Cloud
Betriebssystem: Windows 7
Version: 6.1
Anwendungsarchitektur: x64
Systemarchitektur: x64
Anzahl logischer Prozessoren: 8
Prozessorgeschwindigkeit: 4,0 GHz
Integrierter Speicher: 16365,2 MB
Für Lightroom verfügbarer phys. Speicher: 16365,2 MB
Von Lightroom verwendeter phys. Speicher: 1437,9 MB (8,7%)
Von Lightroom verwendeter virtueller Speicher: 1441,3 MB
Cache-Speichergröße: 680,6 MB
Maximale Anzahl Threads, die Camera Raw verwendet: 8
Camera Raw SIMD-Optimierung: SSE2,AVX
DPI-Einstellung des Systems: 96 DPI
Desktop-Komposition aktiviert: Ja
Monitore/Anzeigegeräte: 1) 1920x1200
Eingabetypen: Multitouch: Nein, integrierte Toucheingabe: Nein, integrierter Stift: Nein, externe Toucheingabe: Nein, externer Stift: Nein, Tastatur: Nein

Informationen zum Grafikprozessor:
AMD Radeon R7 200 Series

Check OpenGL support: Passed
Vendor: ATI Technologies Inc.
Version: 3.3.13431 Core Profile Context 16.150.2211.0
Renderer: AMD Radeon R7 200 Series
LanguageVersion: 4.50


Anwendungsordner: C:\Program Files\Adobe\Adobe Lightroom
Bibliothekspfad: C:\Users\Tim\Pictures\Tim Lightroom\Hochzeit Carolin & Tommy 30.07.2016\Hochzeit Carolin & Tommy NEU\Hochzeit Caro & Tommy\Hochzeit Caro & Tommy (2).lrcat
Einstellungen-Ordner: C:\Users\Tim\AppData\Roaming\Adobe\Lightroom

Installierte Zusatzmodule:
1) Athentech PerfectlyClear
2) Canon Tether-Zusatzmodul
3) Facebook
4) Flickr
5) HDR Efex Pro 2
6) Leica Tether-Zusatzmodul
7) LRT Export
8) Nikon Tether-Zusatzmodul

Config.lua-Flags: None

Adapter Nr. 1: Anbieter : 1002
    Gerät : 6819
    Subsystem : a001174b
    Version : 0
    Grafikspeicher : 2027
AudioDeviceIOBlockSize: 1024
AudioDeviceName: Lautsprecher (Realtek High Definition Audio)
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 44100
Build: Uninitialized
Direct2DEnabled: false
GL_ACCUM_ALPHA_BITS: 0
GL_ACCUM_BLUE_BITS: 0
GL_ACCUM_GREEN_BITS: 0
GL_ACCUM_RED_BITS: 0
GL_ALPHA_BITS: 8
GL_BLUE_BITS: 8
GL_DEPTH_BITS: 24
GL_GREEN_BITS: 8
GL_MAX_3D_TEXTURE_SIZE: 2048
GL_MAX_TEXTURE_SIZE: 16384
GL_MAX_TEXTURE_UNITS: 8
GL_MAX_VIEWPORT_DIMS: 16384,16384
GL_RED_BITS: 8
GL_RENDERER: AMD Radeon R7 200 Series
GL_SHADING_LANGUAGE_VERSION: 4.50
GL_STENCIL_BITS: 8
GL_VENDOR: ATI Technologies Inc.
GL_VERSION: 4.5.13431 Compatibility Profile Context 16.150.2211.0
GPUDeviceEnabled: false
OGLEnabled: true
GL_EXTENSIONS: GL_AMDX_debug_output GL_AMD_blend_minmax_factor GL_AMD_conservative_depth GL_AMD_debug_output GL_AMD_depth_clamp_separate GL_AMD_draw_buffers_blend GL_AMD_framebuffer_sample_positions GL_AMD_gcn_shader GL_AMD_gpu_shader_int64 GL_AMD_interleaved_elements GL_AMD_multi_draw_indirect GL_AMD_name_gen_delete GL_AMD_performance_monitor GL_AMD_pinned_memory GL_AMD_query_buffer_object GL_AMD_sample_positions GL_AMD_seamless_cubemap_per_texture GL_AMD_shader_atomic_counter_ops GL_AMD_shader_stencil_export GL_AMD_shader_stencil_value_export GL_AMD_shader_trace GL_AMD_shader_trinary_minmax GL_AMD_sparse_texture GL_AMD_stencil_operation_extended GL_AMD_texture_cube_map_array GL_AMD_texture_texture4 GL_AMD_transform_feedback3_lines_triangles GL_AMD_transform_feedback4 GL_AMD_vertex_shader_layer GL_AMD_vertex_shader_viewport_index GL_ARB_ES2_compatibility GL_ARB_ES3_1_compatibility GL_ARB_ES3_compatibility GL_ARB_arrays_of_arrays GL_ARB_base_instance GL_ARB_bindless_texture GL_ARB_blend_func_extended GL_ARB_buffer_storage GL_ARB_clear_buffer_object GL_ARB_clear_texture GL_ARB_clip_control GL_ARB_color_buffer_float GL_ARB_compatibility GL_ARB_compressed_texture_pixel_storage GL_ARB_compute_shader GL_ARB_conditional_render_inverted GL_ARB_conservative_depth GL_ARB_copy_buffer GL_ARB_copy_image GL_ARB_cull_distance GL_ARB_debug_output GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_derivative_control GL_ARB_direct_state_access GL_ARB_draw_buffers GL_ARB_draw_buffers_blend GL_ARB_draw_elements_base_vertex GL_ARB_draw_indirect GL_ARB_draw_instanced GL_ARB_enhanced_layouts GL_ARB_explicit_attrib_location GL_ARB_explicit_uniform_location GL_ARB_fragment_coord_conventions GL_ARB_fragment_layer_viewport GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_framebuffer_no_attachments GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_geometry_shader4 GL_ARB_get_program_binary GL_ARB_get_texture_sub_image GL_ARB_gpu_shader5 GL_ARB_gpu_shader_fp64 GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_imaging GL_ARB_indirect_parameters GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_internalformat_query2 GL_ARB_invalidate_subdata GL_ARB_map_buffer_alignment GL_ARB_map_buffer_range GL_ARB_multi_bind GL_ARB_multi_draw_indirect GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_occlusion_query2 GL_ARB_pipeline_statistics_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_program_interface_query GL_ARB_provoking_vertex GL_ARB_query_buffer_object GL_ARB_robust_buffer_access_behavior GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_seamless_cubemap_per_texture GL_ARB_separate_shader_objects GL_ARB_shader_atomic_counters GL_ARB_shader_ballot GL_ARB_shader_bit_encoding GL_ARB_shader_draw_parameters GL_ARB_shader_group_vote GL_ARB_shader_image_load_store GL_ARB_shader_image_size GL_ARB_shader_objects GL_ARB_shader_precision GL_ARB_shader_stencil_export GL_ARB_shader_storage_buffer_object GL_ARB_shader_subroutine GL_ARB_shader_texture_image_samples GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shading_language_420pack GL_ARB_shading_language_packing GL_ARB_shadow GL_ARB_shadow_ambient GL_ARB_sparse_buffer GL_ARB_sparse_texture GL_ARB_stencil_texturing GL_ARB_sync GL_ARB_tessellation_shader GL_ARB_texture_barrier GL_ARB_texture_border_clamp GL_ARB_texture_buffer_object GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_buffer_range GL_ARB_texture_compression GL_ARB_texture_compression_bptc GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map GL_ARB_texture_cube_map_array GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_gather GL_ARB_texture_mirror_clamp_to_edge GL_ARB_texture_mirrored_repeat GL_ARB_texture_multisample GL_ARB_texture_non_power_of_two GL_ARB_texture_query_levels GL_ARB_texture_query_lod GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_texture_rgb10_a2ui GL_ARB_texture_snorm GL_ARB_texture_stencil8 GL_ARB_texture_storage GL_ARB_texture_storage_multisample GL_ARB_texture_swizzle GL_ARB_texture_view GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_transform_feedback_instanced GL_ARB_transform_feedback_overflow_query GL_ARB_transpose_matrix GL_ARB_uniform_buffer_object GL_ARB_vertex_array_bgra GL_ARB_vertex_array_object GL_ARB_vertex_attrib_64bit GL_ARB_vertex_attrib_binding GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_vertex_type_10f_11f_11f_rev GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_ARB_window_pos GL_ATI_draw_buffers GL_ATI_envmap_bumpmap GL_ATI_fragment_shader GL_ATI_separate_stencil GL_ATI_texture_compression_3dc GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_ATI_texture_mirror_once GL_EXT_abgr GL_EXT_bgra GL_EXT_bindable_uniform GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_copy_buffer GL_EXT_copy_texture GL_EXT_depth_bounds_test GL_EXT_direct_state_access GL_EXT_draw_buffers2 GL_EXT_draw_instanced GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4 GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_histogram GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_packed_pixels GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_polygon_offset_clamp GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shader_image_load_store GL_EXT_shader_integer_mix GL_EXT_shadow_funcs GL_EXT_stencil_wrap GL_EXT_subtexture GL_EXT_texgen_reflection GL_EXT_texture3D GL_EXT_texture_array GL_EXT_texture_buffer_object GL_EXT_texture_compression_bptc GL_EXT_texture_compression_latc GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_add GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_texture_rectangle GL_EXT_texture_sRGB GL_EXT_texture_sRGB_decode GL_EXT_texture_shared_exponent GL_EXT_texture_snorm GL_EXT_texture_storage GL_EXT_texture_swizzle GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array GL_EXT_vertex_array_bgra GL_EXT_vertex_attrib_64bit GL_IBM_texture_mirrored_repeat GL_INTEL_fragment_shader_ordering GL_KHR_context_flush_control GL_KHR_debug GL_KHR_robust_buffer_access_behavior GL_KHR_robustness GL_KTX_buffer_region GL_NV_blend_square GL_NV_conditional_render GL_NV_copy_depth_to_color GL_NV_copy_image GL_NV_depth_buffer_float GL_NV_explicit_multisample GL_NV_float_buffer GL_NV_half_float GL_NV_primitive_restart GL_NV_texgen_reflection GL_NV_texture_barrier GL_OES_EGL_image GL_SGIS_generate_mipmap GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_SUN_multi_draw_arrays GL_WIN_swap_hint WGL_EXT_swap_control
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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The driver looks a little out of date (latest version is 16.8.1).
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Tim Paletzki

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Wich one?
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Diko

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Also update to lr 6.6 according to some people there is some improvment. Make your lr cache bigger. Google it. ;)
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Tim Paletzki

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It is the newest Version, my Cache is 75 GB! Not enough?
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john beardsworth

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The graphics card driver, Tim.

Purge the cache, though I doubt that is the issue.
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Hans Douma

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Try optimizing your catalog. It helped me enormously. File>Optimize Catalog
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john beardsworth

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Optimising is important, but with catalogues that have seen a lot of action - days, weeks of use. The OP is hitting problems with new catalogues.
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brett.jr.alton

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I have the same issue as OP, but these suggestions of using the graphics processor and optimizing the catalogue are obvious and repetitive. Can we start talking about better caching, pre-caching and other LR optimizations that will effect the product, not the individual?

My system info...

Lightroom version: CC 2015.6.1 [ 1083169 ]License: Creative Cloud
Operating system: Mac OS 10
Version: 10.11 [6]
Application architecture: x64
Logical processor count: 8
Processor speed: 2.7 GHz
Built-in memory: 16,384.0 MB
Real memory available to Lightroom: 16,384.0 MB
Real memory used by Lightroom: 3,422.4 MB (20.8%)
Virtual memory used by Lightroom: 5,586.8 MB
Memory cache size: 3,770.2 MB
Maximum thread count used by Camera Raw: 8
Camera Raw SIMD optimization: SSE2,AVX
Displays: 1) 2560x1440, 2) 2880x1800
Graphics Processor Info: 
NVIDIA GeForce GT 650M OpenGL Engine
Check OpenGL support: Passed
Vendor: NVIDIA Corporation
Version: 4.1 NVIDIA-10.10.13 310.42.25f01
Renderer: NVIDIA GeForce GT 650M OpenGL Engine
LanguageVersion: 4.10

Application folder: /Applications/Adobe Lightroom
Library Path: /Users/{snip}/Pictures/Lightroom/{snip}.lrcat
Settings Folder: /Users/{snip}/Library/Application Support/Adobe/Lightroom
Installed Plugins: 
1) Aperture/iPhoto Importer Plug-in
2) Athentech PerfectlyClear
3) Canon Tether Plugin
4) Facebook
5) Flickr
6) Format
7) Leica Tether Plugin
8) Nikon Tether Plugin
9) Show Focus Points
Config.lua flags: None
AudioDeviceIOBlockSize: 512
AudioDeviceName: Built-in Output
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 44100
Build: LR5x102
CoreImage: true
GL_ACCUM_ALPHA_BITS: 0
GL_ACCUM_BLUE_BITS: 0
GL_ACCUM_GREEN_BITS: 0
GL_ACCUM_RED_BITS: 0
GL_ALPHA_BITS: 8
GL_BLUE_BITS: 8
GL_DEPTH_BITS: 24
GL_GREEN_BITS: 8
GL_MAX_3D_TEXTURE_SIZE: 2048
GL_MAX_TEXTURE_SIZE: 16384
GL_MAX_TEXTURE_UNITS: 8
GL_MAX_VIEWPORT_DIMS: 16384,16384
GL_RED_BITS: 8
GL_RENDERER: NVIDIA GeForce GT 650M OpenGL Engine
GL_SHADING_LANGUAGE_VERSION: 1.20
GL_STENCIL_BITS: 8
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 2.1 NVIDIA-10.10.13 310.42.25f01
OGLEnabled: true
GL_EXTENSIONS: GL_ARB_color_buffer_float GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_draw_buffers GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_imaging GL_ARB_instanced_arrays GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_provoking_vertex GL_ARB_seamless_cube_map GL_ARB_shader_objects GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shadow GL_ARB_sync GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_mirrored_repeat GL_ARB_texture_non_power_of_two GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_transpose_matrix GL_ARB_vertex_array_bgra GL_ARB_vertex_blend GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_EXT_abgr GL_EXT_bgra GL_EXT_bindable_uniform GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_depth_bounds_test GL_EXT_draw_buffers2 GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4 GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture_array GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc GL_EXT_texture_env_add GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_rectangle GL_EXT_texture_shared_exponent GL_EXT_texture_sRGB GL_EXT_texture_sRGB_decode GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array_bgra GL_APPLE_aux_depth_stencil GL_APPLE_client_storage GL_APPLE_element_array GL_APPLE_fence GL_APPLE_float_pixels GL_APPLE_flush_buffer_range GL_APPLE_flush_render GL_APPLE_object_purgeable GL_APPLE_packed_pixels GL_APPLE_pixel_buffer GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_specular_vector GL_APPLE_texture_range GL_APPLE_transform_hint GL_APPLE_vertex_array_object GL_APPLE_vertex_array_range GL_APPLE_vertex_point_size GL_APPLE_vertex_program_evaluators GL_APPLE_ycbcr_422 GL_ATI_separate_stencil GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_ATI_texture_mirror_once GL_IBM_rasterpos_clip GL_NV_blend_square GL_NV_conditional_render GL_NV_depth_clamp GL_NV_fog_distance GL_NV_fragment_program_option GL_NV_fragment_program2 GL_NV_light_max_exponent GL_NV_multisample_filter_hint GL_NV_point_sprite GL_NV_texgen_reflection GL_NV_texture_barrier GL_NV_vertex_program2_option GL_NV_vertex_program3 GL_SGIS_generate_mipmap GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod 
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Tim Paletzki

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slow slow slow
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Dietmar Mitterer Zublasing

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I have the same problem. 

After x tests with different settings, LR versions, graphic cards (see here:  https://forums.adobe.com/thread/2210245 ) I think that LR has a performance problem with certain CPU architectures. Especially with CPU with many cores. I tested with LR version from 2015.5 to last version 2015.7

The problem on my weak laptop (Intel Core i7-5500 CPU @ 2,4 GHz) does not exist, only on my good workstation (XEON E5-1650 0 3.2GHz, 6 cores.) 

I open a thread here: https://feedback.photoshop.com/photoshop_family/topics/lightroom-clone-and-brush-tool-can-not-stress-the-cpu-is-slow-only-on-cpu-with-xeon-architectures-can-confirm