Speed issues with specific services, probably due to firewall misconfig

[jaclaz]

@needlessWay

/interface bridge filter
# in/out-bridge-port matcher not possible when interface (wg_personal) is not slave
add action=drop chain=forward in-interface=*B

This is invalid (but very likely not connected to your speed issue), see Point #21 here:

GP & CSA for Mikrotik devices

Preamble and disclaimer: The following is a numbered list of what is usually considered good practice or common sense advice when choosing, using, setting up or maintaining a Mikrotik router. It is my personal take on the matter, and in no way approved, endorsed or recommended, officially or unofficially, by Mikrotik or their partners or by anyone else. In other words you are perfectly free to ignore its contents, though they represent (IMHO) a sort of (useful) check list for people starting …

You make extensive use of RAW firewall, in addition to the plain firewall rules, this is unusual, but in itself should not be slowing down the connection to the low speeds you report, though it is likely to have some impact.

As seen from the outside, your overall configuration seems (to me) very complex, very likely you have your reasons for having all those settings, but finding among them which ones could be slowing down the connection seems daunting.