Persistent Redis connections on FrankenPHP with ZTS

[AlexVanderbist]

Hi!

I've been investigating long Redis connection times on a couple of apps running FrankenPHP in classic mode. I've found that the bulk of the connection time is spent on the TLS handshake + DNS resolution. It's about a 10ms to 50ms overhead on a regular non-TLS, direct to IP Redis connection. This usually isn't an issue thanks to persistent Redis connections and connection pooling. However, on the phpredis docs I read the following:

This feature is not available in threaded versions. pconnect and popen then work like their non persistent equivalents.

As FrankenPHP is built using a ZTS enabled PHP runtime, am I right to assume persistent Redis connections are not supported?