Spamming Westend causes `grandpa-voter` to fail

[tugytur]

In preparation for the spamming the Relaychains we were testing it on Westend.

After couple seconds of running the blocktime went >1 minute.

I don't have access to the validator logs/metrics, but thankfully @lovelaced checked.

This error showed up.

@lovelaced and I both suspect it could be caused by the low compute specs of the Westend valiators.

Would appreciate feedback if we should continue on Kusama or if Parity wants to first check some things on Westend. For Kusama, we would first do a 1-3 minute run before doing the full 30 minutes couple days later.

If any more logs are required please reach out to @lovelaced and just let me know if you want me to run it on Westend again.

[lovelaced]

I realized the first graph is for Westend AH (my fault) but the story is the same on the validators.