I've noticed a couple of similar complaints of Object Dock, slow/hanging & lag. I currently am using Windows 10 but this 'hanging-lag', which comes after launching an app from Object Dock, or attempting to launch an item with Object Dock not responding, like it's writing to itself or something is just not correct.
This lagging started quite a while back with Windows 7 (64bit). I use both a tabbed dock at top of screen and a quick launch dock at screens bottom. Both remain off screen/hidden till the cursor initiates, which is also at times a painful delay or lag.
Sometimes the lag is minimal, yet at times it's painfully long. I thought just maybe it wasn't getting enough cpu priority (above normal) so I even tried upping it's priority with no luck.
If I didn't depend on this menuing system so much I would have left it on the backburner 3 years ago... I noticed people have some Windows 10 issues, yet weirdly enough the lag and delays are somewhat less with Windows 10 then they were with Windows 7, but the lag is still here, and I know because I know how just how fast and snappy Object Dock could be while (over) loaded down with many, many (many!!!!) programs & folders spanning 2 disks.
At first I thought my OS was glitchy (Win 7) till I did a clean fresh install which changed nothing. I wish I recorded exactly when this performance issue started.
Hoping this someday gets resolved. Cause even with everything not being copasetic, I'm still a Stardock fan.