Keyboard laggy on Linux?

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If your keyboard seems to take a keystroke to “wake up” on Linux it could be USB power-saving. If the output of cat /sys/module/usbcore/parameters/autosuspend is not -1, you can disable this by adding the kernel parameter usbcore.autosuspend=-1 and rebooting.

Apache RewriteRule Mitigation for log4shell

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Yes, you should update ASAP to a patched version of Log4J.

You should also consider other ways you can be exploited – do you have java processing emails?

But layers of security never hurt, so you can also try this:

RewriteCond %{THE_REQUEST}     \${     [OR]
RewriteCond %{REQUEST_URI}     \${     [OR]
RewriteCond %{QUERY_STRING}    \${     [OR]
RewriteCond %{HTTP_USER_AGENT} \${     [OR]
RewriteCond %{HTTP_REFERER}    \${
RewriteRule .*                 -       [L,R=403]

Of course, if you expect ${ in any of these headers, this will break your site, in which case you may want to restrict the application in some way (such as check for the presence of a tracking cookie).

Note also this will be checked for every single page request, include static. Again this can be customised.