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Hello, On my PC, a full Malwarebytes Anti-Malware scan used to take 1 hour and 15 minutes, but it now takes 2 hours and 15 minutes. I'm wondering if it's because I recently installed Adblock Plus in both Firefox and Internet Explorer. According to two websites, Adblock Plus employs 37,000 filters, so my guess is that having it in both Firefox and Internet Explorer makes it 74,000 filters. Would that be the culprit for adding an hour to my full Malwarebytes Anti-Malware scans? I have recently added the following programs to my PC: January 7, 2014: • Malwarebytes Anti-Rootkit • Malwarebytes Anti-Exploit • Adblock Plus • Adblock Plus Pop-up Addon • Webutation January 8, 2014: • Adobe Flash Player 11 for Internet Explorer • Adblock Plus for Internet Explorer January 9, 2014: • Malwarebytes Anti-Malware Pro license activated • InPaint installed from Giveaway of the Day site January 10, 2014: • Uninstalled McAfee Security Scan Plus which came "bundled" with Adobe Flash (I already have McAfee SecurityCenter) Here are the two websites that mention Adblock Plus' 37,000 filters: [1 of 2] Adblock Plus • View topic - Adblock Plus slows Firefox site load time on warm restarts. https://adblockplus.org/forum/viewtopic.php?t=17158#p80749 [says Adblock Plus has 37,000 filters.] [2 of 2] How to Remove Ads, Wasted Page Space and Annoying Content http://www.techsupportalert.com/content/how-remove-ads-wasted-page-space-and-annoying-content.htm << Performance After a few years of using ABP, I started searching for the source of the constant freezes and memory leaks I was having in my otherwise smoothly running Firefox. EasyList and the other popular filter lists sadly turned out to be the culprits. This is what I found: (1) ABP with subscription lists enabled accounted for 40% of Firefox's internal memory usage, roughly 40MB or about the same as Firefox's own code (not to be confused with the total RAM usage as reported by Task Manager and the like, which is around 200MB for me). Removing the lists entirely (disabling them is not enough!) and leaving only the manual lists reduced this to 400KB, which is pretty much the average of all add-ons; (2) Firefox reacted much more smoothly and froze much less when loading pages with the lists disabled; (3) EasyList contains 37,000 filters at the moment and more are added every week. Only 100 or 200 of those filters had ever had any hits, despite months or years of browsing. The reason popular filter lists make Firefox slow is because of their size. All filters need to be loaded and possibly applied on each page, which is a gargantuan task. <<