
https://cdn.discordapp.com/attachments/ ... 180518.png
In editor, I can set a playback frame rate in preference.
Then I export to gif.

https://cdn.discordapp.com/attachments/ ... 180518.png

https://cdn.discordapp.com/attachments/ ... 28x128.gif
I figured it move too fast, so I go to preference. Then, set play back frame rate = 30.
I export again with the same export setting.

But they play animation at the same speed.
To make it looks like slower, I can set a lower delta time. But it may cause my gif have too large file size. And it is not actual frame rate I want.
I do not use .gif animation in games. But gif animation is good for previewing to my co-workers.