Hi,
Thanks for the question.
The Docket Cache is influence the frontend speed or just backend?
Backend.
Beside the installation, I need to do/change other value?
Default configuration suitable for any site. You may try to change max disk size and max file if the default value is not enough for your site.
https://docs.docketcache.com/constants#docket_cache_maxsize_disk
https://docs.docketcache.com/constants#docket_cache_maxfile
How Docket Cache vs Redis (for example)?
Redis is an in-memory cache, all caches will reside in memory. Docket cache is a hybrid solution, we store cache as plain PHP files and then using OPcache to load caches into RAM, makes it close to the in-memory cache.
Redis is a server-based solution, if want to compare it with Docket Cache, it is better in terms of performance.
Thanks.