Do System background tasks in Windows 7 run throttled?

I am trying to Trace installations, to do that I have to wait for the "systems background tasks" to cool out. Or it traces all the system tasks going on. It can take a some time to finish all the tasks at the rate it is working.

The stuff DOES finish when given time, but then I revert time again (backup) to test a different way. so It is not terrible or never ending, I just have to wait after a reboot or install to trace the next install.

The activity I am seeing Seems to be throttled or limited to ~100k , my system can do 200M max (raid0), sometimes it jumps up in speed. It just feels/looks like it from the graphs and perf data. There is very limited CPU use, and the system is 64-bit version, the CPU is a quad core.

can anybody confirm?

I also saw in passing a thread on changing this throttle, so these background task can get done, and out of the way. But now I cannot find it :-( I hope this is a duplicate post and I just don't know the correct terminology to search it.

If a limiter or throttle of any kind exists, is there a way to adjust that? Is there a command like in XP, to manually start the background performance stuff?

I started applying "suspend" of a task for the first time in my life, but some items will not complete install with a thing called Svhosts (localsystem network restricted) suspended?? I cant very well suspend System.

I am not tracing because I know what I am doing, I am tracing so I can Undo things completely, even years later, it was easy before.

I could assume WHY they would throttle the CPU use or disk activity, its a good thing usually, just not at this time.

Example things in the way of tracing: .PNFs being made from .INIs (then I add in more drivers) Prefetch creation (then I run a few more programs).
The usual logs, recovery, driver depository, MRUs in the registry, other massive registry internals, things related to the big WSXS backup piles. Installing a driver causes a lot of activity, but most of it backup background type.

Sysrestore, defender, and indexing and others, I have mostly stopped for a while, thanks to Q-As here, which doesn't help test a normal system :-) but close enough.