Hello!
This is actually a fairly common question! Unfortunately, Snapchat does seem to have some optimization issues with Android. Here is what I would recommend doing:
1. Make sure you have limited other apps running the background while using Snapchat (close out of everything except Snap and see if the performance improves).
2. Uninstall and reinstall the app.
3. Install an older version of the Snap app. Occasionally, newer releases can have issues with performance. If you want to attempt this after the other 2 options, I can give you a brief tutorial on installing an .apk file
.
Best of luck!