P: Slow performance on Xeon CPUs

Ok. How about logmein. I have it installed on my computer and You can login to my pc from your office and run tests see the settings etc.

Unfortunately we don't have any Lightroom developers in the UK. The easiest way to start is to look at your Lightroom settings from your system info.

Jeffrey. The fact you are asking to post system info after such a long time this issue has been flagged is so disappointing. If I were you I would acknowledge the issue and put all my efforts to fix it, run test systems, use other photographers catalogs if necessary, many of us will help you. I live near your HQ in the UK and will be happy to bring my PC 8 core cpu and show you the problem. I don't think you really need another sys info. Come on. Most of us are computer geeks and this slowdown after restart is not that hard to replicate. All we want is a fix and if you can be honest with us until then it will be apprichated. Thank you for your understanding.

Thanks for doing that Assaf.
If we can get others to do this, they might pick the story up and we'll finally get Adobe's full attention.

I have suggested to fstoppers earlier today to do an article on this issue. We all had enough restarting lightroom every 5 minutes if we want a performance boost. Pathetic.

When Lr starts to getting slower, in addition to the RAM usage, can you check in the Windows Task Manager and note what the reported Lightroom usage for the GDI Objects, Threads, Handles and User Objects?

@188115, if the sliders are really clunky to slide, that seems to indicate that Use Graphics Processor is disabled, or is using an integrated GPU, or a bad driver. 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.

It's a shame Adobe has allowed this to go on for so long.  It's unfair of them to hold us hostage with their software, we've invested in them, they should invest in us.

I've started contacting photography blogs and notifying them about the issue. I hope one of them picks the story up and runs with it. I recommend contacting blogs like Fstoppers yourself and let them know. https://fstoppers.com/contact
If we organize our efforts and make enough noise we can get Adobe to address the issue. 

My CPU is 4 core Xeon 1620 v3 and I have the same problem. While working, LR is gradually becoming slowlier but the task manager says only about 25 - 35% of my system resources are used (I have 32GB RAM). Weird 😞

I have exactly the same problem with E5-1620 v3 @3.50GHz and last LR (at the moment CC 2015.8)