as we start adding more secondary ( >10) connection slowly delay increases and framerate also goes down. How can we achieve the 50 secondary connection with good framerate? Delay is not big concern.
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The '50' was primarily for the allowable KVM connections that could be configured in advance at one time:

As well as a 'reasonable' increase of concurrent sessions over 9.
There has not been any testing on what is practical in terms of a limit to concurrent active KVM sessions, and bandwidth would also factor in greatly, but one should not expect to be able to have 50 concurrent session running on a single Primary.
Now as I checked on website there is only 9kvm(1Primary to 9 secondary ) option is available.
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The corp site allows for multiple activation per key - this would allow you more concurrent Primaries per key, example:

Corp pricing:
https://store.stardock.com/corporatepricing
what is procedure to licensees of 50kvm? can provide link to process the online purchase?
End of shivanandtrivedi's quote
The link I gave you in my prior reply would be how you would order another license / key with only 1 Primary and 50 Secondaries. If multiple concurrent Primaries per Key are something you need, I can see about having KVM 50 added to the corp site (KVM Pro is currently the highest).