We are not currently using Wincache, but thought I would mention this. For some configurations of IIS, Zend Opcache is unusable (it is for us) due to a memory addressing / ASLR issue on Windows:
Event ID 487 from source Zend Opcache
Unable to reattach to base address
Attempt to access invalid address.
https://github.com/zendtech/ZendOptimizerPlus/issues/167
We have not been able to use Zend Opcache for some time now and probably won't until either PHP is stable and fully supported in 64 bit or someone solves this problem in 32 bit (I'm paraphrasing notes from the Github issue.)
I think it would be premature for MS to remove Opcache from Wincache until that issue is resolved.
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