I don’t remember updating to VPS optimized, though few days prior to the update, I had asked the support to install patches/updates for the installed software and at that time php, apache and few more things were updated.
Though a week or so later, I saw the cpanel had been updated and php (5.2.5 to 5.2.6), mysql (5.0.45 to 5.0.51) and apache (2.0.x to 2.2.x) had also been updated to latest build . Ever since then, memory consumption has slight increased for the same number of processes i.e. for 55 process running earlier, the vps used to consume 160-180MB of RAM, now it is using 180-200MB.
Also sometime the vBulletin forum that I run appears slightly sluggish. Though I started using datastore yesterday and that seems to have improved performance.
Now I don’t know whether kh techs updated the vps or it was set to automatic updates, but if they did it, I appreciate the fact that they did that because I like to run the latest version of all the software. However, I was wondering if it could be the case that since KH used to optimize CPanel build, the current VPS Optimized build consumes more memory then their optimized version.