Surprisingly the one with NO UT2 created a larger file, so I am not sure what that means.
It might means several things:
a) you did something wrong when recording the log
b) the effect of UT clobbering Simconnect, is showing on the log as well so, you are seeing a smaller file with it, because other addons couldn't get a chance to issue many commands
c) some events are based on frame rate, they happen at every visual frame so, if your fps was lower with UT2, less of thise events will be generated, so the log was smaller for that reason.
In fact, I've tried the same test, running for 90 seconds, and got similar results, the UT2 version of the file is about 20% smaller. However, I've also counted all the events tied to the frame rate and, guess what, they are about 20% less in the UT2 version, because the frame rate was lower so, I guess this case c).
In the log, it's also possible to check the error conditions (EXCEPTIONS), which are all the errors that Simconnect logs, whenever any 3rd party module send a wrong command or a correct command in the wrong situation (like, for example, trying to destroy an object that is no longer there).
In my test, with LVLD.DLL, UT2Services.exe and Bglmanx.dll + Couatl.exe running, I've counted the following exceptions:
- UT2Services.exe generated 185 exceptions in 90 seconds
- LVLD.DLL generated only 1 exception
- Both bglmanx.dll and Couatl.exe, haven't generate ANY exception
If you can zip your log file (the one with everything in) you can send me via email (use the address on the "Contact" web page), I can check yours, and have a look at the errors.
MAYBE, the handling of too many error conditions, might also contribute putting a lot of strain over Simconnect.