Slow internet speed

Hello guys,

So we changed our ISP, we got a new ISP with a 5g modem. We have 2 cisco router, so I connected the ISP modem to a switch and those 2 cisco routers are connected also to the switch. The cisco routers are connected to each other via NHSRP. So i confirgured the interface of the first router to be in the same subnet to the ISP modem and that on both cisco routers. And also configured the standby IP to be the same on both routers and on the same subnet. But with all this, when i do a speed test on the network, the speed is about 200Mb/s, but when I want to open websites the speed is very slow and it is not consistent. I need help!!!! Thank you all