Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: AMD Radeon HD 7600M Series ATI Technologies Inc. 4.5.13399 Core Profile Context 0
Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-08 22:16, hash: rB0812949bbc3d
blender-2.81- a856c5eccffb -windows64 already broken
blender-2.81- 54a9649e2636 -windows64
Short description of error
vertex selection became terribly slow, worked well in the previous build.
Exact steps for others to reproduce the error