Flash Player 64bit issue

Hello. I am running win 7 pro 64bit and I have some issues with the 64bit version of Flash player 11.3. When I try to use flash content its slows down in lack of better explanation. For instance if I am watching a clip on youtube there are sever video lagging but the audio plays fine or if I try to load something flash based let say a flash game it takes a weary long time to load even if the content itself is quite small and last bet not least if I do an online connection speed check it claims that I only have a speed of 1.5-2 mbits/s. But heres the thing, if I downgrade to version 10 or install the 32bit version all the issues seem to disappear. As in no lagging, the content load at much higher speed and I have an average speed of  24.5-24.6 mbits/s.

And my question is what is causing this issues and is there a way to fix them because if I have a 64bit windows I would very much like to use 64 bit appliances when available

Thank you in advance as well as for you time