Yeah I know this has been beaten to death, and yes I have done various searches on this prior to making the topic. Problem is, despite all that I always get a kind of mixed answer that SpywareBlaster technically does impact and technically doesn't. I have used it far back in the past but for some reason this always bothered me and I've been on the fence for a long time since I formatted to Vista then to 7. Recently though I've really wanted to get back into it but I'm a bit wary. I guess the question is already there: Does SpywareBlaster actually impact performance? I mean this with respect to using Vista and Windows 7 as I remember from the previous IE8 debacle when it was first released (which is now resolved) that IE does play some sort of under the hood role in performance on some things. Am I making a crazy connection here or is there some merit to that? Reason being is that from what I understand your browser/system will ultimately have to do some sort of loading of all these entries at one point or another. I'm not exactly sure of the specifics but I do know a large Hosts file and exceptions list may impact things, and if it all is connected together under the hood it could lead to room for slow downs. It doesn't necessarily mean right now, but since the format so far is to keep adding more definitions, it will eventually get to the point of being incredibly massive. (feel free to correct me if I'm wrong, only going by what I've read) So that being said, can anyone give me a definitive answer addressing this? Do you think I won't have any issues with performance (especially being on Windows 7)? Is there a plan in the future for when the definition size gets way too big? Is there actually a fundamental solution to this in the program that is being/has been addressed? If for whatever reason I do experience slow-downs, does simply disabling protection & uninstalling fix it? Or am I just going nuts? : ) Some supplementary info on this is that I don't really use IE at all, mainly other programs I have use it extensively such as Windows Live Messenger for loading certain ads, etc. Just don't want to see any strange slowdowns if these are connected in any way. Also predominantly I use Firefox (3.6.10) and I'm not sure if this will impact its speed in terms of how it loads these entries. I'd really like to give the program another go, but being the performance freak I am this gnawed away at me too much to make a final decision.