Update FAQ.md

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@ -35,6 +35,14 @@ No, not yet. This is a planned feature.
Possibly - Dendrite does have some application service support but it is not well tested. Please let us know by raising a GitHub issue if you try it and run into problems.
## Is it possible to prevent communication with the outside world?
Yes, you can do this by disabling federation - set `disable_federation` to `true` in the `global` section of the Dendrite configuration file.
## Should I use PostgreSQL or SQLite for my databases?
Please use PostgreSQL wherever possible, especially if you are planning to run a homeserver that caters to more than a couple of users.
## Dendrite is using a lot of CPU
Generally speaking, you should expect to see some CPU spikes, particularly if you are joining or participating in large rooms. However, constant/sustained high CPU usage is not expected - if you are experiencing that, please join `#dendrite-dev:matrix.org` and let us know, or file a GitHub issue.