It’s not just the internet speed, it’s also the latency. You can have really fast internet but if the server responses are slow, it negates the benefit of the bandwidth.
I would first, use Speedtest.com to not only see what your throughput is but also latency. If your latency is high, I would download and install wireshark and then monitor what happens when you visit a website. I had an issue with my small firewall handling several devices so I installed a smart switch to handle a portion of the assignment of addresses etc. This sped everything up dramatically within my home network.
As said above it’s better to have a separate cable modem and router. If you have 30+ devices, things will also bog down since each device adds a little more processing time because your equipment has to handle it all.
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