### Lei Mao

Machine Learning, Artificial Intelligence. On the Move.

# Solve Text Editor Sublime 3 Scroll Lag Problem

### Introduction

Sublime is my favorite text editor for small projects. I have been using it for more than two years, and I found I like it more over Atom and Visual Studio Code. Recently I installed sublime on my new PC, somehow I found when I try to scroll in Sublime, there will be some initial lag. Human beings are extremely sensitive. I felt really bad about it, and once had even switched to Visual Studio Code.

After doing some Google, taking and improving the answers from internet, I finally confirmed the source of the problem and solved the problem.

### PC Configurations

• Intel Core i9-9900K
• Asus PG27UQ 4K 120Hz
• NVIDIA RTX 2080 TI
• Ubuntu 18.04 LTS
• Sublime 3.1.1 (BUILD 3176)

### Phenomenon

In an idle environment, I felt initial lag when I scroll. In an GPU consuming environment, such as training deep learning models, I felt lag all the time when I scroll. So I suspect it has something to do with GPU rendering. Especially for my 4K 120Hz monitor, I guess even rending for text would take a lot of resources.

Then I went to the NVIDIA X Server Settings, in “PowerMizer” tab, the default mode is “Auto”, the Graphics Clock is around 300-400 MHz, and Memory Transfer Rate is around 800 MHz. But whenever I scroll, I would see the Graphics Clock boosted to 1350 MHz and Memory Transfer Rate to 14000 MHz.

### Solution

In “PowerMizer Settings”, change the Preferred Mode to “Prefer Maximum Performance”. This will increase and lock the Graphics Clock to 1350 MHz and Memory Transfer Rate to 14000 MHz. I was afraid that this will increase the power consumption and make the PC super hot. But nvidia-smi told me that the power was only increased from 30 Walt to 60 Walt and the GPU temperature was increased 2 to 3 degrees, which is quite acceptable. After setting to the maximum performance, there is no lag any more when I scroll.

### Final Remarks

There might be still some problems to scroll in Sublime 3 when GPU is utilized 100% such as during deep learning model training. However, I tested Visual Studio Code during deep learning model training, and there is no such scroll lag problem. Therefore, it is sublimes internal implementation issues. I later found from their GitHub that the author has changed the usage of graphic APIs in the development version of Sublime 3 trying to improve the rendering efficiency using GPU. I am looking forward to the next stable release!