Isolated-VM not executing code during slowdown?

[Periosa]

Shard 2 was experiencing some issues this afternoon taking well over 10s to execute each tick. During this time I noticed that a few of the creeps my neighbor has been consistently sending at me were not dying in the same space as usual, so I peeked back through my room history to see how he had snuck around my defenses.

As it turns out, I had no defenses. In fact, I had no code executing AT ALL. My CPU usage was at 0, my console was devoid of errors, and enemy creeps were still moving around in my room.

I decided to switch back to Shared-VM from the new Isolated-VM runtime on a whim, and BAM, my room was up and running again.

A particularly bad stutter: https://screeps.com/a/#!/history/shard2/E8S14?t=4056180

When I changed back to Shared-VM: https://screeps.com/a/#!/history/shard2/E8S14?t=4056350

[Dissi]

@Periosa There are currently some issues related to isolated-vm.
We are actively working on fixing this issue.

You can join our slack to get up to date messages about the current state (you can join the #ivm channel to see details of what's happening).
Please beware that the isolated-vm feature is still in the experimental fase and might cause issues like you described earlier.

You can also subscribe to this topic to receive updates: https://screeps.com/forum/topic/2133/changelog-2018-03-05/14