This plugin is outdated and might not be supported anymore
Static Resource Cleanup by Removing Query Strings

Static Resource Cleanup by Removing Query Strings

Details
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WordPress by default adds query strings “?” or “&” to the static resources (CSS & JS) files used in the site. This plugin will help to remove the query stings from all the static URLs used in the site, thus it will significantly improve site speed scores in services like PageSpeed, YSlow, Pingdoom and GTmetrix.

Resources with a “?” or “&” in the URL are not cached by some proxy caching servers, and moving the query string and encode the parameters into the URL will increase your WordPress site performance significant.

Details

Plugin code:
wp-speed-booster
Plugin version:
1.0.1
Outdated:
Yes
WP version:
2.2 or higher
PHP version:
or higher
Test up to WP version:
4.7.29
Total installations:
20
Last updated:
2017-02-24
Rating:
Times rated:
1
boost
site-speed
speed
speedup