It needs some tweaks to be snappy. The defaults are really bad.
- change database from SQLite to a proper database like MySQL or Postgres, and configure the database server to use your memory fully
- increase the PHP memory limit from the default (128M on many distros) to >1G, the more the better
- install APCu in-memory cache for PHP
- add Redis as additional cache
- turn off the antivirus extension, if installed (ClamAV is useless)
- use http/2 on Apache/nginx to increase performance with multiple connections