Serious Performance Issue on Prime 4+ (OS 4.3) — Slow Browsing, Waveform Lag, and Full Crash During Live Event

Engine DJ Hardware Standalone Controllers
1

Hello Denon Team and Community,

I encountered a critical issue with my Prime 4+ running OS version 4.3 during a live event this past weekend, and I’d appreciate your help in understanding what went wrong.

Setup

  • Prime 4+ with internal SSD (2TB)
  • External SSD (USB 3.0, 2TB, exFAT)
  • Music analyzed and exported via Engine DJ (latest desktop version)
  • Both drives are properly indexed and have been working reliably until now

Issue Description

  1. Unusually slow file browsing
  2. While navigating through folders on both internal and external drives, the Prime 4+ became extremely sluggish, often displaying “Updating…” for several minutes without completing the folder load.
  3. Tried changing source (external > internal and vice versa) — no improvement.
  4. Waveform rendering degraded : After some time, the waveform became choppy and unresponsive, like the system was under heavy graphical load or running out of processing power.
  5. System crash & reboot during performance : Less than 3 minutes after noticing the waveform issue, the entire unit froze and rebooted by itself, causing a complete audio dropout during a live set — highly problematic.I had to quickly switch to a backup player to resume the audio.
  6. After reboot, everything ran normally again for the remainder of the evening.

Questions

  • Has anyone experienced similar performance issues with OS 4.3 on the Prime 4+?
  • Could this be related to database corruption, drive format, system overheating, or OS bugs?

Thanks in advance for any help or insights. This was a major reliability concern during a critical moment, and I’d like to understand how to prevent this in the future.

1 Like
2

It appears that several users are experiencing similar issues with version 4.3.

You can downgrade to version 4.2.0 while waiting for a fix.

1 Like
4

try to optimize your sdd external and ur internal ssd

5

Opera Snapshot_2025-05-19_182534_enginedj.com
Opera Snapshot_2025-05-19_182534_enginedj.com644×1638 117 KB

try this

6

Hi Mate, Which Engine OS version is installed in your Prime4+? 4.3.0 or 4.3.1?

7

It’s been suggested here many times that any time you do library changes (crate creation/deletion, or add/delete music through Engine desktop to run a Library Optimization (clean up) then a backup, everytime. Depending on the library size or type of USB media/drive could be quick or a few minutes, for example one of my external Samsung T9 2tb SSD with +70,000 songs takes about 2min to do an optimization.

This will help with search and indexing speeds on your drives/USB media and greatly reduce library issues on devices.

1 Like
8

correct ,same on my side