Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello dear community. Today I got some kind of lag or bug. The problem is talent for running and mount speed on my pala stopped working or gliched. When I'm running forward with some of my guildmates they are saying I'm gglitching. On my screen they are running faster than me. On their screen they are running faster than me. Also when I'm flying on bird, people saying I'm already arrived but I'm still flying on my screen about 30 secs. I tried to reinstall client and run it with clear settings. still same shit. Any help?

Problem solved. I updated my pc to windows 10. Reverted back. Problem is gone. Seems windows 10 not support dx9 at all. This is a problem of lags it seems.