A mere copy and paste from the thread in General discussion, with the exception of a DxDiag attachment and R3D file of the match that can be seen in the recording.
As of 01/27/2013 after trying for a full day to get rid of weird lag spikes (e.g. during Thresh's death animation), random bug splats during the loading screens and sometimes weird "glide effects" on champions/minions. I finally managed to get rid of most of those problems, to get hit with yet another problem that is making competitive play next to impossible.
I recorded the following short clips (35 second video), in a custom made game on summoner's rift to briefly show you what I've been experiencing the past 1-2 days.
The video (YouTube): Click here
Besides the weird behaviour in the movement, my champion also tends to walk backwards sometimes when I click to move forward. In an actual match I don't have to explain what this means. You simply die for moving out of position for a split second.
Some extra information: Ping during recording and any other matches stays between 170 and 185. The numbers I've been playing this game with for years. (The Netherlands).
The FPS was limited and set to 30 during the recording, hence why it says 30. During normal gameplay it stays between 50 and 100.
No recent changes in hardware. Only software change (about a month ago now), would be the Nvidia driver update the 5th of January THIS year. (310.90)
What's causing this issue? Is anyone or has anyone ever experienced this issue?
Edit: Uninstalling and reinstalling the game didn't fix it. All drivers are up-to-date. All LoL related programs are excluded from being blocked by firewalls.
Pando Media Booster has been uninstalled.