I have a model with ~695k tris. Modifier stack are emply.
Just selecting polygons/edges or vertex took approx 1+ second and more. And i mean just selecting 1 single poly/edge/vertex, not even loops or something like that.
FPS in the viewport are unknown, but its really high, no slideshow or something like that.
My specs are:
3900x, 64Gb RAM, which im pretty sure normally more that enougth for ~700k polys.
WIndows 10, all latest updates, drivers, motherboard BIOS.
GPU are pretty weak, its a GTX1060 3Gb, but again FPS are high, and i dont think what GPU can cause those problems.
Blender version are 2.91.0 downloaded from official site.
Preferences are default except UNDO levels (set to 64).
Memory cache limit doesnt change anything, and i guess shouldnt cause task manager shows what blender use less than 2Gb or RAM.
What i was trying:
Setting priority for blender to High - didnt change anything.