I cant add the w3 total cache on my site! it shows an error that "this plugin is not allowed on our system due to performance, security or compatibility concerns. Please contact support with any questions!" so?
It means that you need to contact with your admin/hosting provider who is responsible for your hosting because this is the only person that would be able to help you out. The issue you have run into, has nothing to do with the BeTheme.
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we use W3 Total Cache and we we pretty good results. You probably can use another one but you need to test it yourself first.