And maybe one more importan aspect if u use IfModule mod_expires.c in .htaccess to spepd up website.
Make new .htaccess in plugin folder an ad this:
<IfModule mod_expires.c>
# disable caching for this directory mod_expires for this directory
ExpiresActive on
# Default expiration: 1 hour after request
ExpiresDefault "access plus 1 hour"
# Image files expiration: 1 hour after request
ExpiresByType image/bmp "access plus 1 hour"
ExpiresByType image/gif "access plus 1 hour"
ExpiresByType image/jpeg "access plus 1 hour"
ExpiresByType image/jp2 "access plus 1 hour"
ExpiresByType image/pipeg "access plus 1 hour"
ExpiresByType image/png "access plus 1 hour"
</IfModule>
Same is for any other weather plugin. With Expires Header activated values changes normally, but icons stay old ones as directed in .htaccess.
Some plugins delete all on update, i dont know if it would help I removed write options from .htaccess.