Passing this on as an observation, not necessarily a bug: After working several days without closing on a non-trivial board (>1200 IC pins, refill takes more than 1 min), memory consumption was about 12 GBytes. After restarting and running DRC, it reduced to 1.2 GBytes. Seems a bit high, therefore this post. It didn’t cause any issues I’m aware of (PC has 80 GBytes).
In times when Commodore had 64kB then IBM-XT 640kB it was hardly to imagine that Personal Computer will ever have 80 GBytes 
When designing my first PCB using computer I had even to reduce 640kB of RAM as I had to use 80kB for RAMDISC (my PC had no HDD, but only 2 floppies 360kB each).
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Well, yes, I mentioned it because I wouldn’t notice if memory usage spikes.
This really doesn’t belong here but in actually quite a few corners of embedded space, “external” memory is still special, (developer:) a luxury or (project customer:) an addiction that needs to be cured
Why do you use this workflow? It sounds pretty shaky to me. I tend to make backups every few hours or so, and turn my pc off when I go to sleep. Just a few days ago I had a little mishap in the kitchen. I spilled some water on the extension cord to a water boiler, and this triggered the GFI, which also cut power to my PC. Things like this happen, but when your workflow is robust, the risk of loosing a day’s work is minimal.
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I think we have a misunderstanding, I didn’t say I never save my work (plus command line git).
I noticed this as well. Also the performance gets slower after a while which is fixed after a restart.
Application: KiCad x86_64 on x86_64
Version: 9.0.0+1, release build
Libraries:
wxWidgets 3.2.2
FreeType 2.12.1
HarfBuzz 6.0.0
FontConfig 2.14.1
libcurl/7.88.1 OpenSSL/3.0.15 zlib/1.2.13 brotli/1.0.9 zstd/1.5.4 libidn2/2.3.3 libpsl/0.21.2 (+libidn2/2.3.3) libssh2/1.10.0 nghttp2/1.52.0 librtmp/2.3 OpenLDAP/2.5.13
Platform: Debian GNU/Linux 12 (bookworm), 64 bit, Little endian, wxGTK, X11, KDE, x11
Build Info:
Date: Mar 1 2025 11:58:55
wxWidgets: 3.2.2 (wchar_t,wx containers) GTK+ 3.24
Boost: 1.74.0
OCC: 7.6.3
Curl: 7.88.1
ngspice: 39
Compiler: GCC 12.2.0 with C++ ABI 1017
KICAD_IPC_API=ON
Locale:
Lang: en_US
Enc: UTF-8
Num: 1.234,5
Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)
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9.0.0 had some serious memory leaks. Try 9.0.1 rc1
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Will do when it’s available for Debian.