There are some general known issues/things about using SSL. The most important one is that SSL/HTTPS does not perform as well as HTTP. I believe the performance difference is fairly insignificant. Personally I do not feel it is necessary to encrypt an entire website. What I do feel is useful and important is to encrypt things that deal with “shops, carts, transactions and things of that nature that deal sensitive data should be encrypted”. The most important benefit is that that then end user will have more faith and trust that their data is encrypted/secured/safe.
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