Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.87
Intel Core i7-5820K 3.3Ghz
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: rB375c7dc4caf4
Short description of error
[On my file i have two object. One is created from particle system and metaballs - converted to mesh (~99K). Object have Subdiv. modifier. When i press Tab to edit, blender seams freeze for about 15-20 s. after this i could edit model. Same when i want exit edit mode. When i apply subdiv modifier everything work correctly. Another cases is when i want unhide collection or object with this model (by pressing disable in view icon) or switching on/off subdivsion modifier blender need this 15-20 s. to complete action.
In scene i put another object. This is a model of the cap also with subdivision. Entering edit mode work good but unhiding collection or object (by pressing disable in view icon) work with same problems like first one.
I test this scene in 2.82, 2.81, 2.80 and have same result. I haven't this problem (entering edit mode) on version 2.79.
Another problem i have with object-1 is when i export him using obj format i couldn't import correctly to 2.79 version. Format fbx let me import this model to older version.
Maybe it's another bug but could be somehow connected.
Thanks for Your great work
Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]