I have a Quad core dedicated server from Wiredtree, which is running Apache 2.2.x and mod_php 3.3.x and I am thinking of migrating to Litespeed, mainly to speed up the loading time of my websites, since the server barely hits 50% load, even in peak time. Now the thing is, I am running few wordpress blogs, an IPB forum and a large vBulletin forum with vBSEO. All these sites are using mod-rewrite and vBulletin forum's rewrite rules have been added to the httpd.conf to boost performance. That vBulletin forum also sees a lot of attachment (mainly images) uploads (we have around 150k attachments) and these images are then resized and saved to the hdd and displayed inline i.e. we do not convert them to thumbnail. Some of these attachments over time, have been saved with nobody ownership. Additionally, not everyone resizes the images before uploading them. So we will have people who are uploading set of images (restricted to 10 per uploading cycle, but no restriction on the number of images a user can upload in a post) after images, which are in full resolution and can take anywhere from 5 to 20-30minutes to upload and get posted (depending on user connection speed and number of images). With this in mind (especially the last bit), how painful/painless would a switchover to Litespeed be and what possible issues can I bump into? Additionally, with the above in mind, in which form should I get the php complied as from the Wiredtree staff and is there any specific instruction I need to give them? Also, the image quality even at 90% isn't all that great, so which image package should I get installed for resizing?