Which is the PTC site which irritates you while browing the ads?

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While browsing the ads in some PTC sites, the ads will load quickly and we need not wait for more time to earn the credit.Some of the sites will take long time to get loaded.But few of the sites, due to the design and security, we can not browse the ads quickly, as like companybux.com. In your PTC experience, which is the PTC sites making you tensed while browsing the ads? Is there any other sites like companybux?