I don’t really have much more information. Just wondering if anyone else is having the same issue. After the latest update the DRC spends a ton of time sitting at the screenshot below. After a few minutes it progresses but takes so much longer on each of the processes afterwards. In total I am spending 10-15 minutes on each DRC check. It also eats up a ton of memory and CPU while it’s doing this. I’ve never had this kind of behavior. DRC has always taken just a few dozen seconds.
I just ran DRC on an Olinuxino A64 Rev C and timed it coarsly around 8 seconds. My PC has been purring happily with it’s Ryzen 5600G for 2 years now.
Application: KiCad PCB Editor x86_64 on x86_64
Version: 8.0.1-8.0.1-0~ubuntu20.04.1, release build
Libraries:
wxWidgets 3.2.2
FreeType 2.10.1
HarfBuzz 2.6.4
FontConfig 2.13.1
libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3
Platform: Linux Mint 20.3, 64 bit, Little endian, wxGTK, X11, xfce, x11
Build Info:
Date: Mar 14 2024 15:11:44
wxWidgets: 3.2.1 (wchar_t,wx containers) GTK+ 3.24
Boost: 1.71.0
OCC: 7.6.3
Curl: 7.68.0
ngspice: 42
Compiler: GCC 9.4.0 with C++ ABI 1013
Build settings:
Some of the commits since 8.0.1 tagging look like they are performance related, a few by Jeff Young might be fixes
I tried out the latest testing version and there is no improvement. I tried running DRC with the kicad-cli and it was as fast as it usually is. It seems that with the GUI, the DRC is spending a long time on checking copper zone clearances. Any ideas on how to debug this?
Can you share this project or make a demo project with the issue. The developers will be interested
I will see what I can do. I cannot upload the files because it is company-owned.
This seems to only be happening on files that were made with 8.0.0. Designs that I am making new with 8.0.1 don’t seem to have this problem. I will see if this pattern holds up but that is what I am seeing so far.
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I see a commit today that fixes a very slow DRC issue on Windows OS
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Yea it’s probably the same bug, low cpu usage + long delay on checking zone clearances.
It’ll happen on any zone-dense board but overall the bug impacts all DRC the entire time since v7.
@PatrickAtNion You can get a testing build of 8.0 here:
https://downloads.kicad.org/kicad/windows/explore/8.0-testing
if you want something pre-8.0.2 that should be fixed
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The next Testing build I think.
What I don’t understand is why I do not have this slowdown on my 6 layer projects on Windows using 8.0.1
Wouldn’t have posted that if it wasn’t already true 
My commit was b9a6f479, which is the latest in testing from last night.
Not enough zones. The one sample project that was tested had 2000 possible zone to zone collision checks :3
What I would call a pathological case. I have about 20 zones