I'm asking that because I'm developing a new SEO tool and aside it, I created an automatic proxy scraper which is REALLY fast at scraping and filtering out unworking proxies (checks proxies lot faster than Charon for example). I don't own Scrapebox so I would be interested in how fast it can check 10'000 proxies? Any other proxy software statistics would help too! Thanks in advance guys, I will release this proxy checker tool for free here on BHW so no advertising here... However that SEO tool won't be free, just so you know! Edit: Now I'm also testing ProxyFire.