That is weird, for me, the performance has improved a lot with patch 8, I was pleasantly surprised. In previous patches, I have had similar issues to the ones you described.
I am playing on a laptop (ASUS TUF GAMING FX504GM_FX80GM)
Processor: Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz (12 CPUs), ~2.2GHz
Operating System: Windows 11 Home 64-bit
Memory: 8192MB RAM
Video Card: NVIDIA GeForce GTX 1060 /Intel(R) UHD Graphics 630
