HHVM may not be at the current PHP level (7.1 or so). I saw one reference that said it was 5.4, so you may find that it doesn't support recent OC versions. If you already have such a system, check its documentation to see what PHP level it's at, check the minimum PHP a given release of OC requires, and if it looks good, give it a try. OC is free, so you're out nothing but some time.
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