[SOLVED] Slow software in LXC/VM

tall1oN

New Member
Sep 19, 2025
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Stahnsdorf, Germany
Hey, I've been using Proxmox for about half a year now and am really happy with it, but unfortunately I haven't managed to solve my two main problems during that time.

My setup:
- 3x Promox VE 9.0.10, originally installed Promox VE 8 over existing Debian 12
- 2x 5950X, 1x 5600X (also tested 3800X)
- issues are present on all 3 machines

1. A specific piece of software I use (extdb3 extension for Arma 3 gameserver) runs extremely slowly, but only in LXCs/VMs that I host with Proxmox. I therefore have to run the game server on the Proxmox host itself, where the problems do not exist. Usally I receive the query response in <1s, but when it runs via LXC/VM it takes several seconds, sometimes even longer. I'm not sure if it's due to extdb3 itself or if I've configured something incorrectly in Proxmox. I couldn't find any issues with networking and I am 100% sure the issue is not with the database.

2. Possibly related to 1: With some of my LXCs, SSH always hangs for about 30 seconds when establishing a connection, after which everything works without any problems. However, the error does not affect all LXCs; with some, it works normally. //Edit: solved by enabling nesting

Has anyone ever experienced something similar?
 
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I found another executable exhibiting the same kind of problem. Running Bun + Prisma inside an LXC shows the exact same behavior as extDB3 for Arma 3.

I tested mysql-client directly from the LXC and could execute the same queries in about 6ms. But as soon as I try Prisma, the Bun process hangs for minutes, sometimes even taking 16 minutes for a simple update.

I’m fairly certain this is some kind of Proxmox/LXC configuration issue, but I haven’t been able to find any information about similar problems online.

Has anyone experienced this or have any ideas on what could be causing such extreme delays inside an LXC/KVM?