>>1024943
Show the topology of the the hand

>>1024943
Bruh fix that finger's weight

>>1024943
What is weight painting?

>>1024943
If you have any thing generative on while running the animation, then it will slow down. What do I mean by generative? That can be things like modifiers that are generating new geometry like for example, the subdivision modifier. It's generating new geometry. And when the animation is active, it has to generate new geometry every frame. This causes slowdown. So you want to disable things like that while you're testing your animation.

Personally, I rand into this issue the other week. I couldn't figure out why it was so laggy, until eventually I disabled everything, and only enabled things 1 at a time to test their effects. I discovered the culprit. I used a geometry node to generate eyebrows on the character. I didn't apply the node, because it was still in testing itself. So when I activated the animation, it was generating eyebrows for every frame. As soon as I disabled it, the animation was perfectly smooth.

Note: there is a difference between hiding and disabling. The eye icon merely hides things from view, but they're still being calculated. Hiding will not get rid of lag. You have to disable it by pressing the viewport icon that looks like a monitor.
Disabling from viewport will not disable from render. That's another 3rd option, with an icon of a camera.

So make sure that any excess generators are disabled from viewport in order to eliminate lag while the timeline is active.

>>1025091
>there is a difference between hiding and disabling. The eye icon merely hides things from view, but they're still being calculated.
Not OP, but this explains some performance issues I've experienced while testing. Thanks anon.

>>1024959
Hell, not even that, OP needs to unparent the armature and realign that shit. That's embarrassing even for a first-timer.

If it is laggy you are doing something wrong. Check your settings, try to find out what is bugging out.