Lightroom Classic: Lag with 4K laptops?

  • 1
  • Question
  • Updated 3 months ago
  • (Edited)
I plan to buy a laptop to replace my PC. I will of course buy a latest generation i7 (U low voltage) with a 100% sRGB screen and 16 GB RAM.

Provided I get a discrete GPU like a MX150, is 4K/UHD an option ? On my current desktop (older i5-4670K with a GTX1060) with a 4K display, I sometimes experience mouse pointer lags and I want to avoid that (typically, when switching image while 100% in develop module, and mouse over the picture while rendering). It doesn't happen in FHD. I also don't like that develop sliders sometimes take a little time to redraw when switching picture.

I don't care about export time but I want a snappy interface. With the specs above (i7-8565U+16GB and MX150+2GB), should I expect lags ?
Photo of Pierre Gérard

Pierre Gérard

  • 10 Posts
  • 3 Reply Likes

Posted 3 months ago

  • 1
Photo of TangCanada

TangCanada

  • 147 Posts
  • 69 Reply Likes
But of course, LR lag is getting worse. Everyone complains, search the forums.
Photo of Pierre Gérard

Pierre Gérard

  • 10 Posts
  • 3 Reply Likes
In my case, I used to quit LR years ago but I went back in september because I think major improvements have been achieved, up to a point that it became useable on my system. My question is adressed to people owning recent 4K laptops : do they experience lags ?
Photo of David Gottschlich

David Gottschlich

  • 4 Posts
  • 0 Reply Likes
I suspect that you'll need a more powerful discrete GPU than the MX150 to avoid display/mouse lags. You may need more than 2GB of graphics memory.

I have no problems on my desktop machine (it has an (older) Intel i7-6700 and an Nvidia GTX 1070 with about 6 GB) driving two 4k displays and a 2.5k display, unless I'm rendering at the same time. It can slow down if I used dual-display mode with LR CC classic, but there's still no mouse lag. But the 1070 is--I think--substantially more powerful than the MX150.
Photo of Pierre Gérard

Pierre Gérard

  • 10 Posts
  • 3 Reply Likes
Thanks for the input. I lead me to investigate further. My desktop has a more modest GTX1060 driving a single UHD screen. I've reproduced the phenomenon (mouse cursor lag) again and again, an the GPU usage never went over 15%, while CPU toped 100%. And the GPU memory usage was barely above 2GB. My GTX beeing only 3x faster than a MX150 (your 1070 is almost 4x faster than a MX150), I suspect after all that the MX150 could be enough and that my bottleneck is actually the CPU.

So I'll defenitely buy a i7 and not a i5 of the same generation (even if th difference is low between both). And I'll cross my fingers that I'm not wrong about the MX150.