Hello,
I don't know if you have found a solution since your post, I had the same issue and tought maybe this can fix that for you as well. At first everything runs fine, after a while, objectdock starts lagging pretty heavily. Here's what solved the issue for me.
Open C:\Program Files (x86)\Stardock\ObjectDock folder
rename dock64.dll ->dock64.dll.old
rename dock64.exe ->dock64.exe.old
That's it, hope it helps.