Speed.cloudflare.com slow upload speed, ISP says no issue on their side

So I ran the speed test on speed .Cloudflare.com/

And it seems like the upload results fluctuate a lot

For example on the 18th May:

Today 10th June:

I’ve got symmetric 1gbps from Hyperoptic Ltd (AS56478)

speedtest. net and fast. com both show ~900 upload speed.

I’ve spoken to my ISP and they’ve said that they only see about 3gbps utilisation on their link to the Cloudflare network and that they’re pretty sure it’s not an issue on their side.

Is the speedtest not supposed to saturate a 1gbps link?
It’s the Cloudflare LHR site it’s connecting to.

I’ve done the speedtests using IPv6

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