Defragging using the right defrag software and the right defrag method is all that is needed. Defragging before every flight is not necessary if you use the right defrag software and use it right. If a defrag before every flight really does make a difference it would be because the disk is not defragmented correctly to begin with. That is why you need to use the right software for defragging and the right approach.
The Windows defrag is garbage for real optimizing. It is not designed to optimize the MFT or for game performance. You need professional payware defrag software to accomplish that goal and set up/used correctly.
http://www.simviation.com/cgi-bin/yabb2 ... ;start=0#5The routine in the 2 posts can not be done in VISTA except you CAN use O&O Defrag 10, just omit/skip the SPACE defrag after it has been run the FIRST time and ONLY use the COMPLETE/NAME defrag thereafter in VISTA/XP. With O&O defrag version 8.5 and Windows XP you can follow that O&O Defrag instruction list TO THE LETTER.
Also, if a hard drive is greater than 70% full you can expect very nasty disk stutters and slowdowns
As for reducing texture and AG sizes... I have said this before and I will say it again... DONT MESS WITH IT
Those original resize hacks for RTM had purpose for VERY slow cards/systems but the trade off was you LOST quality and created other problems. To do so with SP1 or SP2 is WRONG. Leve them alone and upgrade the system, and, learn how to tune FSX/drivers for you hardware.
Drivers:
http://www.simviation.com/cgi-bin/yabb2 ... 53/165#171Tuning FSX:
http://www.simviation.com/cgi-bin/yabb2 ... 3998514/60adding in the FSX.cfg autogen lines
TERRAIN_MAX_AUTOGEN_TREES_PER_CELL=xxx
TERRAIN_MAX_AUTOGEN_BUILDINGS_PER_CELL=xxx
are required for slower systems. I would start with values of 600/300 and a slider setting of 50-75% then increase the values in the lines if possible on very slow systems. Most modern cards (79xx-8xxx) do not need those lines in the config after SP1 and with SP2 autogen batching further increases performance.
FSX needs a minimum of 2 gigs of memory for decent performance in XP, 3 in Vista but it will work with 2. It also needs a 512MB+ video card although 256 will work, 128 is suicide and try to get any scenery