'Bandwidth limit on google cloud platform

I wonder if someone can help ! I seem to have a problem with my google cloud VM machine( 4 cores, 32Gb ram) , where the upload speed seem capped at 4Mb/s its limiting my webserver serving capability. grateful for the help

please see test below: 
C____@instance-1-xxxxx:/home/$ speedtest-cli
Retrieving speedtest.net configuration...
Testing from Google Cloud (35.xxx.x.xxx)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Community Fibre Limited (London) [1.12 km]: 3.972 ms
Testing download speed................................................................................
Download: 2223.93 Mbit/s
Testing upload speed......................................................................................................
Upload: 4.17 Mbit/s

uses 4VCPU



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