Wireguard and long distance VPN high latency and blurry streams

Hi, I hope you are all fine.
I am a bit struggling with wireguard on the latest mikrotik OS.

My configuration as follows.
Mikrotik CAP ac in Austria is the VPN Server.
It is connected to a 250/250 fibre connection.
CPU on CAP always less than 10 percent and ram also very low.

I am connecting to this server from South Africa on a fibre 50/25 via wireguard VPN.
My router in SA is a HAP ac2.

Streaming services like Youtube is working amazing.
If I want to connect into streaming TV services (Joyn, Canal+ or SimpliTV, I experience blurry results.
Speedtest tells me that ping is over 200ms.
Already changed the MTU to 1330.

Is the distance a problem?
Is the download in South Africa too less (50/25)?

Any suggestions?

Thanks in advance!

Regards.
Arthur

p.s. Last 100 meters from the fibre connection my device is connected via cubes pro; so that should not be a problem at all. Anyway; if I connect directly behind the router in SA. I get the same result.