Suggestion: document resource requirements

[matrixbot]

This issue has been migrated from #6367.

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Description:

Can some rough estimations of what CPU performance is needed for which kind of usage?

Example of usage

• room with 30 people with E2EE
  • with most people from other instances
• bringing with IRC or Telegram, etc

Example of low end servers that are attractive to self host thing cheaply:
https://www.kimsufi.com/uk/servers.xml
Which limitations should we expect with CPUs such as these? :

https://ark.intel.com/content/www/us/en/ark/products/49489/intel-atom-processor-d425-512k-cache-1-80-ghz.html
https://ark.intel.com/content/www/us/en/ark/products/58917/intel-atom-processor-n2800-1m-cache-1-86-ghz.html