How to shorten loading screen time

I am currently working on a game, when I click play button, sometimes loading takes a huge amount of time (around one minutes or so), How may I shorten the loading time. What causes the issue, is it a roblox issue, or my games issue?

My game does not include any script, gui. it is just a very basic build with around 500 blocks and 20 decals that I’m testing with.

The filtered logs from last time I experienced the issue (Hopefully I removed all the tokens and stuff):
0.542.0.5420509_20220904T154200Z_Player_D28CE_last - Copy.log (65.8 KB)

Can you provide a video/ link to the game?