HBMQTT poor performance causing HA slowdowns

[nordlead2005]

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Home Assistant release (hass --version):
0.57.0 to 0.62.1

Python release (python3 --version):
3.5.2

Component/platform:
HBMQTT

Description of problem:
hass program will use excessive CPU and slowly increase CPU usage until it consumes 100% of a single core. This leads to ERROR (MainThread) [homeassistant.core] Timer got out of sync. Resetting littering the log file and automations being delayed by 30 seconds or more.

Expected:
hass should use a reasonable amount of CPU.

Problem-relevant configuration.yaml entries and steps to reproduce:
https://github.com/nordlead2005/home-assistant-config/tree/0fb831ad87c77ff17663c039f4e524293835e8e3
Here is my config

1. Use embedded mqtt broker
2. Add mqtt components
3. Wait??

Additional info:

As you can see in this CPU usage chart, a single core was pegged at 100% at the start, and a reset of hass caused it to drop, but you can see that it is trending upwards. hass was then restarted and again CPU use trended upwards. To debug the problem I decided to switch to Mosquitto and get duplicate setups running by sharing a single MQTT broker. You can see that I rebooted ~9:30 and the CPU usage stayed low from then on. I've been running for an additional day and CPU usage is still low in the single digits.

In the following photo you can see a day of Mosquitto and the CPU usage is low as expected. My server does more than run Home Assistant, so those spikes are probably caused by other programs, and hass is running and performing as expected.

[balloobbot]

There hasn't been any activity on this issue recently. Due to the high number of incoming GitHub notifications, we have to clean some of the old issues, as many of them have already been resolved with the latest updates.

Please make sure to update to the latest Home Assistant version and check if that solves the issue. Let us know if that works for you by adding a comment 👍

[balloobbot]

This issue will be auto-closed because there hasn't been any activity for a few months. Feel free to open a new one if you still experience this problem 👍