In reply to Guardianugarus:
BetterFPS, FastWorkbench, FastFurnace etc.
Try installing a few optimization mods
In reply to charger_0707:
I think you might have put this thread in the worng place, then.
I think you have to update the pack to a different version ex. 1.0.1 instead of 1.0.0. You can change the version when you export the pack before you upload it to CurseForge.
Because then Twitch would see that oh, there is a new update available. I will now show the update button
I am happy that it worked :)
I found the problem. The modpacks file is set to the type "Alpha". I am pretty sure that if you change the type to "Release" it will soon be available on the Twitch client.
Are any settings set to not show the modpack? What's the name of the modpack?
Do you have the same framerate on a new world?
Step 1. Answer: Have you tried reinstalling the pack?
Step 2. Answer: Have you tried reinstalling the Twitch Client?
If in any of the cases your answer is "no" you should try out those things, but remember to take backups of the files you want to keep.
In many cases it helps to reinstall the Twitch client. I have a friend that also had an issue where doing what you tried didn't work, but as soon as he had reinstalled the Twitch client it began working again.
It usually takes a while for the Twitch client to show new modpacks and/or modpack updates. However, if they restart their Twitch clients it might display right away. It has worked for me before.
At the time I've posted this comment it probably already showed up, didn't it?
Have you tried restarting the server?