How can webform performance be improved on low internet connection?
To enable all caching:

Navigate to &quot;Extend&quot; and enable the following modules:

Internal page cache
Internal dynamic page cache


Navigate to &quot;Configuration &gt; Development &gt; Performance&quot; and enable cache for a period of time (E.g. 6 hours) and check both the options for &quot;Aggregrate CSS/JS&quot;

Hopefully that may help with your issue.