Hi 
Since i play with 2.9.1 o noticed an obvious burden in verts selection. And the more vertices in the mesh, the slower is the selection…
Any idea for the reason of this ?
On a plane subdived by 200 all seems okay… but on my meshes ( having say… 3000 verts ) it’s daaaaaamn slow ! and i don’t know why…
Did anyone exprience those kind of sloth ?
Happy blending !
EDIT: my cpu is a ryzen7. Okay i know how to kneel it and it’s certainly not vert selection that can do it 
I reply to myself as something is going strange 
I just opened the same file on another cvomputer ( maybe all textures are not found ) and the C-KEY selection tool works fast and fine 8-o
Just like if blender slows down after several hours of running…
looks quite strange
Happy blending !
Okay. i reply again to myself as i found what was going wrong, and this might be, though it’s not a bug, some kind of malfunction…
When i got this:
vertex selection ( one by one or with the C-KEY ) is extremely slow.
When i got this:
vertex selection is absolutely fluent and works fast and fine !
You will note the difference between the 2 images formats in the UV editor.
The 1st one ( slow ) is RGB float and the second one is RGB byte.
It seems like when selecting vertex ( wich are drawn in the UV editor containing the image ) the whole image is fully redrawn ( wich takes lot of time as it’s floats ). I guess it works the same with the 2nd image but i guess RGB bytes are faster to draw than RGB floats.
So the malfunction question comes with the full image redraw when a vert of the mesh is selected.
Couldn’t it be left as is ?
Latest info when the image in the 1st screenshot is zoomed enough, vertex selection becomes fluent again.
This is what makes me think this slothj is a matter of full UV client window redraw…
Anybody got idea on this ?
Happy blending !
