Fixing lag on Chromebook

YO  something weird is happening with my Minecraft pe every time I open my inventory it lags and freezes my screen for a bit then goes back to normal with a "Minecraft isn't responding message" I'm using a Lenovo Chromebook Duet 10 any fix to this? Cuz it would be a waste of 20$ I could have got some McDonald's chicken nuggets 😡😡😡