Cache js or css files

Note that merging JS in an uber file is not per definition the best way to go; it depends on the 1) host and 2) browser and 3) howmuch js/css you need on each page.

http/2 can get all the resources over a single tcp connection, and hence merging the files is a wors idea then just loading what you need*. However http/2 only works on newer systems (it requires openssl 1.0.2) so check with the host.

See for example : https://ma.ttias.be/http1-vs-http2-page-loading/

* depending on the requirements