Hello,
max_execution_time is a limit for the execution time while running the script. For example if you import content and script need more than 30 secs then you may face the problem with demo content import. But depending on other server settings script could finish its work faster. So, if you didn’t face problems with theme options then don’t worry about this parameter.
The PHP Max Input Vars is the maximum number of variables your server can use for a single function. If the value is too low, you may experience problems such as can’t save menu settings when added a lot of items.
These parameters can be increased from the server-side, so just contact your hosting provider.
Regards