Hi, I've made a post at the autodesk forums as well but maybe somebody here has some experience too:
im using maya 2018
problem is after adding blendshape nodes (created from shape editor) to an animation layer, whenever I select the associated mesh or animation layer I have a freeze up of several minutes. Same on deselection. Also FBX export freezes up during the "exporting geometry" stage. It did eventually go but only after about 5 minutes.
I believe its related directly to something with the blendshapes interaction with animation layers as there was no performance issues whatsoever before adding this. The simple workaround is revert to before I did this, but I'd rather solve directly if possible.
Other factors may be immportant - I am using an advanced skeleton rig with blendshape face setup, so there is quite a bit of blend layers already. Maybe in adding the blendshape node to animation layer i inadvertantly am sampling all the nodes or something? I tried optimizing the scene and deleting static channels but it has made no difference.
Any troubleshooting advice is appreciated. I search and search but can't find anything that seems related at all.