Avidemux 2.8.1 multicore multithread question

[avilon]

I use Avidemux with codec HEVC x265 for occasional video conversion. Sometimes conversion takes 12 hours with my Intel i5 CPU.
Does Avidemux can use contemporary 12-13-th gen Intel i7 CPU multicore multithreaded encoding?

I'm planning to upgrade my PC but I'm not sure if I should also upgrade CPU level.
From i5 to i7 or i9?
Does anyone has any CPU efficiency related experiences to share.
Thanks.

[eumagga0x2a]

Unless you need the very best quality and compression rate and don't convert HDR sources, adding a decent NVIDIA RTX-30 graphics card would give you speed increase of many orders of magnitude when using "Nvidia HEVC" encoder rather than x265.