Remote Desktop through RD - speed?

At a customer I can dial into using a VPN and a Remote Desktop. From this Remote Desktop I have to go further using another Remote Desktop session (RD-RD).

The second RD session is quite slow compared to the first.

Question: Could this be because the connection to the second RD is bad, to the first RD it is good?

If connections between all RD-connections inside the company (not included the first RD) are good, the speed of all connections are based on the first connection, right?

Means if the first connection is bad, all are bad.

Means if the first connection and all others are fast, all are fast and it is not getting slower due to a lot of RD-tunnels (RD-RD-RD-RD... inception)

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