And to add to it ... http://www.gamesas.com/bgsforums/index.php?showtopic=1071593 has really contributed to performance in my game. Used in combination with OSR on my Vista 64 rig is working great.

►"Making BSAs was far more efficient. With loose files, defrag will put them where it thinks is best. Which may separate them by quite a bit. As a BSA, it's all one file to the OS. So there's much less time spent running all over the platter to get the stuff . . . The bigger key here is that getting it to fall in one large contiguous chunk so the disk access is smooth and not jumping all over the platters. Pick a size for the paging file that's large enough to handle 4x your physical RAM. Don't just let Windows manage it, because Windows does a lousy job of this and leads to mass fragmentation." -Arthmoor
►The_TJ's response:
CODEUsually, one should not change the pagefile size unless one gets messages that it is too small. The pagefile works in a complementary way to the RAM, which means that the more RAM you have the less pagefile you need. It may be true that when Windows changes the size of the pagefile it causes some fragmentation. It may be possible to counteract this (and eliminate overhead) by setting the pagefile minimum and maximum at the same size, rather than allowing it to change in size during operation. For the best results, defragment your hard drive before doing so, preferably not by the Windows defragmenter (which isn't very good). As a general rule of thumb follow the scheme below:

If you are running a 32-bit Windows version and:

1. You have less than 2 GB of RAM, set pagefile at 1.5 times your RAM
2. You have between 2 and 4 GB of RAM, set pagefile at 2 GB
3. You have more than 4 GB RAM, you probably have 64-bit Windows because anything over 4 GB of RAM doesn't work on 32-bit computers and setting pagefile higher than 4 GB has no use either

If you are running a 64-bit Windows version:

1. Click Start, point to Administrative Tools, and then click Performance
2. Click System Monitor
3. In the right pane, click + (the Add button)
4. Click Use local computer counters
5. In the Performance object list, click Process
6. Click Select counters from list, click Page File Bytes Peak, click Add, and then click Close
7. Let the counter run while playing Oblivion, or whatever it is you spend your time on
8. Note the maximum value for the Page File Bytes Peak counter, multiply that value by 0.70 and set your pagefile accordingly
9. The theoretical size limit of the pagefile for 64-bit Windows is 16 TB

Sources:
http://support.microsoft.com/default.aspx?...kb;en-us;237740
http://support.microsoft.com/default.aspx?...223&SD=tech
http://support.microsoft.com/kb/889654