Not good for Gig Speeds

I use the app on a daily basis at work. When the service is higher than 200Mb, the app doesnt give an accurate speed test. I test on my Mac and I get 500-600 Megs using the website. When I check using the app on my IPhone 6S or iPad, the test cuts off at around 200Mb on the downstream.

Mjnp4 about Speedtest by Ookla, v3.7.1