[Bug 3817] InstallShield very slow when copying many small files

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=3817

------- Additional Comments From [e-mail]  2006-30-07 18:03 -------
Using oprofile, I generated a list of all of the functions using over 1% of the
time in the applicate:
407955   20.6001  ntdll.dll.so             RtlUpcaseUnicodeString
309817   15.6445  libwine.so.1             wine_cp_wcstombs
218996   11.0584  ntdll.dll.so             RtlIsNameLegalDOS8Dot3
198561   10.0265  libwine.so.1             wine_utf8_mbstowcs
118514    5.9845  ntdll.dll.so             RtlUpcaseUnicodeStringToCountedOemString
90594     4.5746  ntdll.dll.so             wine_nt_to_unix_file_name
74824     3.7783  ntdll.dll.so             RtlUnicodeToOemN
58600     2.9591  libwine.so.1             memicmpW
54659     2.7601  ntdll.dll.so             ntdll_umbstowcs
45692     2.3073  ole32.dll.so             StorageImpl_GetNextBlockInChain
43063     2.1745  ntdll.dll.so             RtlUnicodeStringToOemSize
35359     1.7855  ntdll.dll.so             hash_short_file_name
26010     1.3134  ole32.dll.so             StorageUtl_ReadDWord
25451     1.2852  ntdll.dll.so             .plt
24873     1.2560  ntdll.dll.so             find_free_area
21688     1.0952  libwine.so.1             tolowerW

As can be seen, RtlUpcaseUnicodeString is the top CPU user which is likely being
called by the file or loader code.