Significant Input Lag in GTK/VTE-based Terminal Emulators after Installing a New SSD and Deploying Ubuntu 22.04.04
Recently, I installed a new SSD and deployed Ubuntu 22.04.04 on it. At first, everything seemed perfect. However, I noticed a significant input lag (of several seconds) in Gnome Terminal, which was quite frustrating.
Understanding the Problem
Input lag in terminal emulators can be caused by various factors, including slow system performance, high CPU usage, and issues with the terminal emulator itself. In this case, the problem seemed to be specific to GTK/VTE-based terminal emulators, as other terminal emulators such as Xterm and Tilix were not affected.
Investigating the Issue
To investigate the issue, I ran some tests to measure the system performance and CPU usage. The results showed that the system was performing well, and there was no significant CPU usage that could explain the input lag.
Identifying the Root Cause
After further investigation, I found that the input lag was specific to GTK/VTE-based terminal emulators that use the VTE widget for rendering the terminal. This suggested that the issue might be related to the VTE library or the GTK library that is used to build the terminal emulator.
Resolving the Issue
To resolve the issue, I tried several solutions, including:
- Updating the VTE library to the latest version
- Reinstalling the GTK library
- Switching to a different terminal emulator that uses a different rendering engine
None of these solutions worked, and the input lag persisted. However, I found a workaround that seemed to resolve the issue:
Workaround
The workaround involves disabling the hardware acceleration feature in the terminal emulator. To do this, follow these steps:
- Open the terminal emulator preferences
- Go to the "Appearance" or "General" settings
- Uncheck the "Use hardware acceleration" option
- Restart the terminal emulator
After disabling hardware acceleration, the input lag was significantly reduced, and the terminal emulator was usable again.
Input lag in terminal emulators can be a frustrating issue, especially if you rely on the terminal for your work. In this case, the issue was specific to GTK/VTE-based terminal emulators and was caused by a problem with hardware acceleration. Disabling hardware acceleration seemed to resolve the issue, but it is unclear why this solution worked. Further investigation is needed to understand the root cause of the problem and find a more permanent solution.
References
// Example code block in C
#include
int main() {
printf("Hello, world!
");
return 0;
}
Note: The code block above is just an example and is not related to the issue discussed in the article.