Cacti scores low on performance audit on lighthouse audit

[TheWitness]

Describe the bug
Cacti is scoring low from a performance perspective on the lighthouse audit available in Chrome. This bug will cover a set of changes that improve that score, but may not resolved all issues.

To Reproduce
Steps to reproduce the behavior:

1. Open the Cacti website using chrome
2. Press F-12 on Windows to bring up developers tools
3. Goto the Audit tab and run the audit
4. See score

Expected behavior
Cacti should behave as best as possible, knowing that some performance hit's can not be addressed except by the customer due to the OSS nature of the tool.

Screenshots

[TheWitness]

New score after tuning.

[TheWitness]

I think the performance number is deceptive, since the items it's complaining about are already cached. So, it's non-blocking. But this is better than it was when we started and I've see some pages with performance numbers closer to 44.

Reading through the Accessibility score, I did find some real target's for improvement, but those will have to take place in the 1.3+ timeframe, since they have a large scope.