Speed test return 0 for local pygrid

[vvmnnnkv]

Description

When speed test is executed against pygrid running in local machine w/o docker, it can return 0 which doesn't reflect real speed.

How to Reproduce

1. Run pygrid on MacOS with dev_server.sh
2. Execute MNIST example, see pygrid logs

Expected Behavior

Instead of 0 we should return big number.

Screenshots

n/a

System Information

• OS: [e.g. iOS]
• OS Version: [e.g. 22]
• Language Version: [e.g. Python 3.7, Node 10.18.1]
• Package Manager Version: [e.g. Conda 4.6.1, NPM 6.14.1]
• Browser (if applicable): [e.g. Google Chrome]
• Browser Version (if applicable): [e.g. 81.0.4044.138]

Additional Context

Add any other context about the problem here.