Should I use ClamAV?

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http://serverfault.com – I installed ClamAV and PHP-ClamAV on my Ubuntu server. Everything works... But it is extremely slow. Even when I just call basic functions without scanning a file. So it got me wandering if I really needed ClamAV and if they were other alternatives to protect my server from potential problems with user uploaded files. So should I use ClamAV or is there better and faster solutions to protect my server from user uploaded content? (HowTos)