How many routes are we allowed to have in Traefik?

Traefik Traefik v2 (latest)
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1

We have a server that handles for example 10k users, and every user has his own domain

Now when every user wants to reach his domain we should put some ID to his request's header, we used Traefik for this scenario.

And now we have for example 10k Routes in our Traefik and this issue is increasing in the form of a linear graph.

The question:

  1. What is the benchmark of Traefik for a high amount of Routes?
  2. Is there any better solution or tool that we can use instead of Traefik in this scenario?