The notorious multi-threading bug

The multi-threading bug still exist in path of exile 2 engine iam not talking about the freeze in loading bug but rather CPU latency spikes, is the same bug that people have been reporting back then in path of exile 1, i think it's related to certain processors and the CPU spikes is more aggressive on some processors than others, but even on the unaffected processors there is still some weird CPU spikes that happens even if it's minimal (example on the reddit link below), this problem could also be related to the PC loading screen freeze to a degree (due to the rapid CPU latency spikes) iam just guessing here but the data point out there is a general problem with the multi-threading coding and it need some rework/fixing.

Old threads/links about the same problem
https://www.pathofexile.com/forum/view-thread/3408520
https://www.pathofexile.com/forum/view-thread/3210088
https://reddit.com/r/pathofexile/comments/15ggnzv/multithreading_latency_spikes_in_3212/
https://reddit.com/r/pathofexile/comments/siz63w/psa_the_late_january_patch_introduced_a/

Here is an example tested on an old machine under Vulkan which shows some aggressive CPU spikes (Vulkan/Dx12 both have the same issue) and it only starts to happen once the shader cache finish caching (green graph) that due shadering cache increasing CPU load while processing which leads to reduction in CPU latency spikes (white graph) but once the shader cache ends it start to happen as the CPU Load threshold falls off.



Which lead to the concluded workaround me and others provided back then and it still works but not really ideal as you have to "fake" increase the CPU load with either tools or any other tasks or do the power plan trick to force the CPU load to be high while playing.

Here is LatencyMon running for 1 min on the main menu while the spike occurring showing the system latency is unaffected by the game CPU spiking which indicate is the problem with the game engine.



Here is the same test done on Path of exile 1 main menu showing the same bug however latest path of exile patches made the issue a bit less aggressive but it's still there.



LatencyMon 1 min stats



Tests done on Fresh installed windows 11 pro (26100.1742) debloated and tweaked.
Both games on steam



Just wanted to share my thoughts about the problem and provide more info/insight. hope you guys finally figure it out, it's a really old engine bug.

If there is any more info required let me know the forums have a lot of data from many different people at this point.

Finally latest content update 0.2 fixed this long standing issue, please do the same for poe1 :)