Did speed test on my 2 droplets, which are in the same location (LON1). I get wildly different results. Why?

1st droplet:

Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Structured Communications (London) [0.96 km]: 2.18 ms
Testing download speed................................................................................
Download: 1861.33 Mbit/s
Testing upload speed......................................................................................................
Upload: 366.57 Mbit/s

2nd droplet:

Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Spitfire Network Services (London) [0.96 km]: 2.65 ms
Testing download speed................................................................................
Download: 3102.50 Mbit/s
Testing upload speed......................................................................................................
Upload: 1664.52 Mbit/s