How many tabs. How many icons. This may be the culprit coupled with your box's specs...
Adding to this, another determining factor could be where are the tab's icons that you're using located, such as a large subdirectory, proprietary folder or another drive. This takes an amount of seek-time as well.
never really considered it problematic but ya I see a longer load time with tabbed docks too
While I agree with the number of tabs/icons point, I have been using five dock layouts for years now and I do have to agree with the original poster
I agree with you both.
I don't look at it as a problem, but my system does wait for my five single tabs longer than anything else on boot. I see nothing detrimental towards the over-all system behavior, because all I start up with is OD, WB and a wall.
And I would imagine the work-around could be not to launch Object Dock at startup if you don't like the way it's booting.
I guess you can sit with a stopwatch to see the difference in nanoseconds.
But since I asked my system to launch OD on boot, to me it's worth waiting. So use these apps to your liking but it's also our discretion in determining what's best for our system's behavior pattern.