Severe lag with high fire rate explosive weapons when ACE Medical enabled

[Uspr111]

Mods:

• Arma 3: 2.20.152984 stable
• CBA: 3.18.5.251221
• ACE3: 3.20.2.108

Description:
Severe performance degradation occurs when firing high fire rate vehicle-mounted weapons with explosive ammunition while ACE Medical is enabled. The shooter experiences significant lag in both singleplayer and multiplayer. In multiplayer, continued firing results in being kicked from the server. The issue is completely absent when ACE Medical is disabled.

Steps to reproduce:

1. Enable ACE Medical module
2. Disable ACE Ballistics and Fragmentation
3. Mount a high fire rate weapon with explosive ammunition on a vehicle (reproducible on vanilla vehicles)
4. Fire continuously at targets (effect amplifies when firing at groups of AI)
5. Observe severe lag on shooter's client
6. In multiplayer: continue firing to trigger server kick

Expected behavior:
Weapon should fire without causing excessive performance issues or server kicks, similar to behavior when ACE Medical is disabled.

Where did the issue occur?

• Dedicated / Singleplayer / Editor (Singleplayer) / Editor (Multiplayer)

Log Files:

• 3 RPT files CBA+ACE3, CBA, Vanila

Additional context:
Issue occurs in both multiplayer and singleplayer environments. Three identical singleplayer tests were conducted to isolate the issue:

1. Vanilla Arma 3: No performance issues
2. CBA only: Minor performance impact
3. CBA + ACE3: Severe lag (same symptoms)

The lag is observable even in singleplayer, demonstrating the issue is not network-related. In multiplayer, the performance degradation is severe enough to trigger server kicks. Issue disappears completely when ACE Medical is disabled, confirming the connection to ACE Medical module specifically.

Screenshots:
Video evidence (singleplayer tests showing lag):

1.Test with CBA+ACE: https://youtu.be/c6aZ5Y4xn-A
2. Test with CBA only: https://youtu.be/a5Cf3JHivHs
3. Test Vanilla: https://youtu.be/hQEGLYUE7wo

[rekterakathom]

I can reproduce this, but I don't think there is a way for a situation like this to not lag considering the amount of calculations going on. A single shot into a large unit pile can result in 1000+ instances of damage that needs to be handled (aka calls to handleDamage).

Images from ArmaScriptProfiler:

[Chpook]

This is a serious issue, and something needs to be done about it! It's most likely due to the same issue that occurs when firing mortars—after a while, the game simply crashes, making it impossible to reconnect to the server.