WP Rocket v3.2.1.1 running fine.
JUST FR INFO:
YOU MIGHT HAVE NOTICED THE IMAGIFY IMAGE OPTIMIZATION PLUGIN (OPTIONAL) INSIDE WP ROCKET OPTIONS, I HAVE TESTED LOTS OF IMAGE OPTIMIZATIONS PLUGINS, ONLINE FREE+PAID SERVICES.
AFTER HAVING EXPERIENCES ON THESE IMAGE COMPRESSION STUFFS I MUST SAY NOTHING BEATS
TinyPNG.com IN TERMS OF POST-COMPRESSION IMAGE QUALITY + LOWEST IMAGE SIZE + COMPLETELY FREE SERVICE.
CERTAINLY WORDPRESS IMAGE OPTIMIZATION PLUGINS DO THINGS AUTOMATICALLY, KINDA LESS HEADACHE, BUT IF YOU LIKE JUST GIVE IT A TRY

YOU WILL GET THE LOWEST POSSIBLE IMAGE SIZE WITH HIGHEST POSSIBLE IMAGE QUALITY, I HAVE BEEN USING IT SINCE OVER 2 YEARS, ALWAYS SATISFACTORY RESULT.
PS: Not advertising TinyPNG.com
I love admiring the deserved ones 
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THANK YOU VERY MUCH my friend for this recommendation



there is a plugin for wordpress for TinyPNG, what do you think about it ?