Container mempool_api_1 cosumes a lot of CPU

[kirillkovalenko]

UmbrelOS 1.2.2
Bitcoin node 27.1
Electrs 0.10.2
Mempool 3.0.1

My Umbrel instance runs as HyperV virtual machine with 4 CPU and 32gb of RAM.

On my instance the mempool_api_1 container constantly consumes a lot of CPU; even when mempool's UI front-end is not opened the web browser. According to docker stats the CPU consumption almost always stays above 100%, with spikes well above 300%. For example:

CONTAINER ID   NAME                           CPU %     MEM USAGE / LIMIT     MEM %     NET I/O           BLOCK I/O         PIDS
f1633f635e44   bitfeed_api_1                  1.69%     585.4MiB / 31.34GiB   1.82%     18.4GB / 1.63GB   405MB / 1.83GB    29
729834237b5c   mempool_api_1                  269.44%   1.918GiB / 31.34GiB   6.12%     544GB / 4.85GB    1.15GB / 27.3GB   18
c89f85153d9e   bitcoin_tor_1                  0.53%     36.48MiB / 31.34GiB   0.11%     3.42GB / 2.78GB   193MB / 263MB     1
b8a73a20a448   bitcoin_bitcoind_1             5.93%     3.956GiB / 31.34GiB   12.62%    4.2GB / 455GB     144GB / 16.4GB    19
654b960f9f03   syncthing_server_1             2.47%     823.3MiB / 31.34GiB   2.57%     94.6GB / 2.16GB   21.2GB / 113GB    25
4aade2080f50   gitea_server_1                 0.10%     98.54MiB / 31.34GiB   0.31%     109MB / 40.5MB    1.04GB / 230MB    12
[other containers with less that 0.1% CPU are skipped]

And the docker top mempool_api_1 shows that CPU is being eaten by node /backend/package/index.js

UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
umbrel              66290               66238               0                   Oct20               ?                   00:00:06            /sbin/docker-init -- docker entrypoint.sh ./wait-for-it.sh mariadb:3306 --timeout=720 --strict -- ./start.sh
umbrel              66461               66290               0                   Oct20               ?                   00:00:00            /bin/sh /backend/start.sh
umbrel              66766               66461               65                  Oct20               ?                   1-14:38:35          node /backend/package/index.js

Is this a known issue? Is this an Umbrel's specific issue at all, or is this mempool's behavior by design?