Does Time Capsule limit download speed?

[s2s]

I have been with 1Gbps Fiber for many years, I am using Apple Time Capsule as wire/wireless router, I was able to get 980Mbps speed test result on wire and 650Mbps on Wireless AC in the first few years after subscribed to 1Gbps ISP, very happy with that.

But, download speed significantly dropped in the past 1-2 years, the same wireless AC, now only able to get 300Mbps. I tested wire too, by using speedtest app on the latest Apple TV 4K which comes with Gigabit Ethernet, I got only 450Mbps.

Both wire and wireless dropped 50+%.

ISP said they are fine, the only thing I changed on Time Capsule was firmware upgrade (7.7.7 & 7.7.8), I am not sure if these firmware limit download speed? Any advice?

Thanks

 

[370zulu]

Have you tried with a device directly to the cable modem to see what your speed results are? This could help to troubleshoot where the bottleneck is coming from.

 

[fhall1]

Have you tried with a device directly to the cable modem to see what your speed results are? This could help to troubleshoot where the bottleneck is coming from.

This. Could be something as simple as a cable that went bad (I actually had that happen).