I'd like to suggest an IDE featurre to delete orphan/stranded arduino files that may accumulate and cause issues. For various reasons, orphan/stranded arduino files may accumulate and slow IDE performance. This was noticed a long time ago and when I checked my hard drive there was a surprising amount of what appeared to be undeleted temporary files.
::C:\Documents and Settings\zoomkat\Local Settings\Temp\deletetemp.bat
del jna*.tmp
::del console*.tmp
::del untitled*.tmp
del fla*.tmp
for /d %%a in (console*.tmp) do rmdir /s /q %%a
for /d %%a in (untitled*.tmp) do rmdir /s /q %%a
for /d %%a in (build*.tmp) do rmdir /s /q %%a