Nope, same here. Soundtoys also slow, but not as slow as PSP Vintage warmer.
There is a recent update:
PSP VintageWarmer2 v. 2.7.3 version history
Bugfixes:
PSP MicroWarmer, PSP VintageWarmer and PSP VintageWarmer2 were causing crashes while GUI opening in HOSTs based on JUCE SDK - fixed,
PSP MicroWarmer’s, PSP VintageWarmer’s and PSP VintageWarmer2’s editors were sometimes stretched (only VST3 on Windows PC) - fixed,
PSP MicroWarmer was turning off while moving from insert to insert in Protools 12 - fixed,
meters were sometimes freezed when session was suspended (only VST3 format) - fixed,
PSP MicroWarmer, PSP VintageWarmer and PSP VintageWarmer2 had wrong latency compensation in PT12 at 96kHz sampleRate and above (since 2.6.0 version) - fixed,
Various minor bugfixes
I still have to install it, so I don’t know if it fixes this problem.