PCI Latency Tool 3.0

PCI Latency Tool by Szymon Modzelewski is a utility for advanced users who need fine-grained control over PCI device behavior on Windows PCs. It allows you to read and adjust the PCI latency timer values stored in each device’s configuration space, helping optimize how long a device can hold the PCI bus. Proper tuning can reduce audio crackling, video stutter, or input lag caused by bus contention, especially on systems with multiple high-demand devices.

Key features:

• Enumerates PCI/PCIe devices and displays current latency timer values
• Lets you set custom latency values per device to balance bus access
• Option to restore defaults if changes don’t yield the desired result
• Useful for troubleshooting audio workstations, gaming setups, and legacy hardware

Notes and cautions:

• Intended for experienced users; incorrect settings can degrade performance or system stability
• Administrator privileges are typically required
• Some changes may be reset by drivers or firmware on reboot
• Always document original values before making adjustments

PCI Latency Tool provides a focused way to experiment with PCI latency settings when you’re chasing hard-to-diagnose stutters or contention issues, giving you control that typical driver panels don’t expose.

PCI Latency Tool is developed by Szymon Modzelewski and is used by 1 user of Software Informer. The most popular version of this product among our users is 3.0. The names of program executable files are LtcyCfg.exe, _4D6BFDDA323315BF3DC76F.exe.

You can check MSI DPC Latency Tuner, ASTRA32 - Advanced System Information Tool, QuickFix Tool and other related programs like 8x8 Network Diagnostics Tool at the "download" section.