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FSUIPC low FPS

Posts: 1

Alex320

Registered

Topic starter

April 8, 2026 6:07 am

(@alex320)

Joined: 5 days ago

I am experiencing a major FPS drop when running FSUIPC7 with Microsoft Flight Simulator.

Without FSUIPC7, my simulator runs normally at around 50 FPS.
As soon as I launch FSUIPC7, the FPS immediately drops to around 15–20 FPS, making the simulator difficult to use.

MSFS runs normally before opening FSUIPC7
FSUIPC7 connects successfully to the simulator
CPU and memory usage remain normal in Task Manager
Even when FSUIPC7 is launched alone (without Pegasus or any other external software), the FPS still drops
I already added:
- InitDelay=20
- DetectToConnectDelay=10
- TrafficScanPerFrame=0
- SimConnectStallTime=1
It improved slightly but the issue remains

I also noticed that the problem appears immediately after SimConnect connection.

Could you please advise what could cause this and if there is a recommended stable version or additional parameter to reduce this impact?

1 Reply

Posts: 251

FSUIPC

Admin

April 8, 2026 11:24 am

(@fsuipc)

Joined: 9 months ago

FSUIPC does nothing with graphics and should not affect the FPS that much. It will, of course, use other resources, and especially if your system is CPU bound then you may loose 2-3 FPS but no more.

Loss of FPS can be caused by:

1. Auto-save, especially with complex aircraft (such as PMDG). The FPS drop will only occur when the autosave is active, and there are things you can do to eleviate this (e.g. removed the folders used to save flights from anti-virus scanning activity).

2. The log or MSFS console being flooded by messages. Check your MSFS console (in developer mode). This usually only occurs when requesting a simvar that doesn't exist, which results in message flooding of the MSFS console.

Posted by: @alex320
↑
I already added:
InitDelay=20
DetectToConnectDelay=10
...
SimConnectStallTime=1

Those parameters won't affect FPS, and should be tuned for your system.

Posted by: @alex320
↑
TrafficScanPerFrame=0

What is this parameter and where did you find this? That doesn't exist as far as I know...!

If not using the AI tables, to reduce resource usage you can set

ProvideAIdata=No

and also maybe

ProvideAIairports=No

John