bitdefender total security 2015 slows down computer

I can't be 100% sure it will work in your case but if you're having similar issues to me it's worth a shot and may also help Bitdefender team work out what the problem is although i'm not too bothered about having the ports option off as my router takes care of that anyway! Good luck all. Ignis.sys in latencymon is no more, it's there but it's all 0's after it and the highest i've seen ndis.sys & tcpip.sys(which were my biggest problems) is 1.6ms max and under every hour or so. So, I opened Bitdefender, modules and then firewall and turned off the 'block port scans inn the network' module and low and behold when I started up Latencymon again there were no high 100's execution time or high DPC's which usually within seconds there would be loads of them! I've ran my system for over 4 hours now with no issues like before, I mean I get the occasional 0.2ms glitch every hour or so but that's it, no more robotic stuttering and Youtube is finally fully watchable again! So I went off searching the interwebs and eventually found a page on an Avast forum mentioning a problem they had with windows 8.1 & their port scanning module in the firewall and it made me wonder if it was the same problem in my case even though it's a different Anti virus.

Basically I knew it had to be a program or driver i'd installed as I'd literally just built a new Intel/Nvidia PC on Tuesday and eventually had the same stuttering etc issues in Youtube as I did on my old AMD/ATI setup.

I just joined to mention my 2p's worth! I too had been experiencing this issue for around 2 weeks and it was driving me bonkers and I just worked out how to fix it (or at least it did in my case anyway!).

Bitdefender total security 2015 slows down computer