Yes, I've recently noticed that Sophos can slow down my browsing. It's still beta, so we'll have to wait to see if it improves until they release the final version.Sophos right now I don't care for, also it can really slow browsing.. InterceptX with integrated HMPA may prove interesting. Panda is lackluster, especially for PUA in my experience. I like Emsisoft, and currently have 10 PC 3 year license, it's effective with A2 and Bit engines and a really nice Web Scanner that picks up things most products do not. However I have found the software can be buggy at times as the only downside. Emsisoft is ridiculously good at finding PUA though.
Actually my 2 favorite AV's are Emsisoft and Trend Micro. Since I have Bit Defender on the gateway, I tend to lean to Trend for blended protection.
Zemana was always there because it was very lightweight and offered 5 additional engines.. Now? Not so sure.
I've been an Emsisoft user for a little more than 10 years, and yes, it can be buggy sometimes, but an excellent product.
In my recent experience ZAM did a better job than the products I've mentioned.
Let's see how it evolves into it's "Ultimate" version.