Lightroom 6 / CC2015: Very slow UI response with background export(s) running

Ok, this makes sense: Even with only one export running, LR 6 now already uses nearly 100% of the CPU - I didn't notice that at first. So it really makes no sense to start multiple parallel exports anymore.

Thanks!

P.S. It can be flagged as "not a problem", then!

Just to jump in here I have a PC that is pretty much top spec 8 Core I7 5960x with 32 GB Ram using Samsung 2000 MB/s M2 SSD and 980GTX Graphics card and Lightroom CC runs so slow, not even building 1:1 previews help. So I can confirm its not a hardware problem, its a software problem for sure.

Going back to lightroom 5.7

I am tempted to do the same

Interestingly I have a 2012 i5 with 4.5 GHz, so quite powerful still, 32 GB of RAM, 1 TB SSD for catalog etc. Windows 7. And I have a Core M tablet with 128 GB SSD and 4 GB of RAM, Windows 10. The desktop, while usually faster, is barely usable while exporting. Even with one export task it gets sluggish. And not only in the export module. In the library too. The tablet however does fine... I mean it does slow down, but nowhere near to the sluggishness of the desktop.

Graphics acceleration is activated on the tablet, deactivated on the desktop (because there it's hopeless even without exporting).

I think 3 things would be great to see:
Export tasks get split out to a different process, so that we can set the priority to idle. Or Adobe itself prioritizes it as idle by default. That way we can continue to work while exporting. Same thing with imports, rendering previews, ... all tasks that can chuck along in the background. It really makes no sense having to wait with export until we leave the PC.

The ability to pause exports. You can pause other things already.

The ability to queue exports, perhaps with a checkbox. Adobe has that kind of functionality in the Media Encoder. The reason why I start several exports in parallel is because I need to export a few thousand files in one folder, a few thousand in another, ... and so that the computer doesn't run out of work I'll start them at once. They don't have to be processed at once though, which is inefficient anyway.

No, it has nothing to do with the GPU.

See: "Edit: It makes no difference whether GPU usage is turned on or off".

And: Victoria Bampton answer "each export is running parallel exports". That causes the lags when one unnecessarily starts multiple parallel exports. Which is not a real problem.

By the way: The export is not (yet) accelerated by the GPU.

If I had a machine that was even close to being underpowered I could wonder but basically just out of the box with a 980. i7 and 32 gigs RAM. Nope...there is a problem but I'm sure they will put a fix on it fast....it has to be in the spotlight.

The strange thing is that it will run ok for just a little while and then start to slow down and like you said...spotting and the brushes slow down and lag.

I really feel sorry for the people that work at 90 miles an hour an pump things out all day.

I would not upgrade if I had 5 (CC) running and glad I did not delete it as it runs perfect. I use 5CC and uninstalled 6.

Been wondering two things....is there something that is running in the background like FRec or is it not cleaning up something as it makes changes.

Well if your having issues with it using an i7 processor and 32 gigs then there is really an issue! I still have 5 installed as well. I have one set of images I processed in 6, so for those images I think I'm stuck unless there is a way to get them into the 5 catalog with my adjustments(?)

i deleted my 5.. can i reinstall it?

I have less of an issue on a Core M with 2 cores, 2 GHz max and 4 GB RAM than on an i5 with 4 cores, 32 GB and 4.5 GHz. I think it has something to do with the graphics card of the Core M being better (deactivated GPU acceleration on the i5). Or perhaps with Windows 10 being better.

The same here :-(

so im sorta confused... i get how to downgrade from lr6 to lr5, but what do i need to do to my catalog to ensure the edits i made in lr6 stay with me in 5.7?

The way it works is that the changes to the catalogue you've made, like adding photos, generating previews, virtual copies, and creating collections can't be ported over to LR5.7. Which sucks. But the edits to your photos, like ratings, metadata changes* and develop edits are baked into the photos (* as long as you've either selected automatically write metadata changes to files in the Preferences, or at least selected all the files and clicked command or control + S). Those changes were all still there for me when I switched back to LR 5.

Do you still have your LR 5 catalogues?