This is a ticket (just) about execution performance, but this sucks regularly, so:
It's broken since 0.4.0 at least (or since forever?).
I report it against 0.4.8-dev-664-gf463ebe.
Steps to reproduce:
-Double-Click C:\reactos\readme.txt (or any other arbitraty txt-file)
-It will open up properly in notepad.exe, but it will take very much time before the text is actually rendered to completion (slowness)
Only thing that is logged then, is
But the logging is not the reason for the slowdown.
I verified (all tests done in same virtualization):
-our notepad run in W2K3_SP2 is fast
-W2K3_SP2-notepad run on W2K3_SP2 is fast
-W2K3_SP2-notepad run on ros is slow
-our notepad run on ros is slow
I conclude: It is not our notepad-binary that sucks, but either text-rendering, scroll-bar-rendering or file-IO that is slow.
I suspect it may be related to the scrollbars.
Eventually related: CORE-13631 or CORE-11561.