You can check your internet speed by doing a speed test by visiting Speedtest.net. A good download speed is at least 25 Mbps for downloads and 3 Mbps for uploads, and also a good ping rate is 0 ms. It means that smartphones or smart home devices communicate easily with remote servers.
If your internet speed is lower than that, you may want to contact your internet service provider to see if you can get a faster speed. They may provide you with a new modem or router.