Introduction
Welcome! If you're here and reading this, it's because you're experiencing problems with Super Mario RPG Legend of the Seven Stars. I'm dedicating this thread to fix all known problems for the ROM. Posting in the comments or creating several threads over the same issues is counter-productive so I'll be combining everything I find and adding it here. I encourage anyone who has problems to post below and share. This will help a solution sooner.

Known Issues
-Freezing
-Sprites may take awhile to load (Land's End Desert Rooms and Tadpole Pond's Musical Tadpoles Room)
-Frame Rate Drops (Running through rooms with several monsters or during battle)

Freezing Points
-Sometimes when you use the menu (Items or Equipment usually)
-Sometimes when you acquire a star (2nd, 3rd, 5th, 7th)
-Moleville Minecart Ride
-Immediately after the fight with Johnny
-Whenever Breaker Beam is used

Freezing Fix Method 1
The first method for fixing the freezing issues uses the Save State [F2] and Load Save State [F4]. Right before you reach any point that freezes you should Save State your place and when the game freezes, you should Load Save State to try again. If you do this a couple times, you might push the game through the freezing and can continue with no problems.

-In the process of making a short video. Will add this tomorrow

Freezing Fix Method 2
This method is a little more efficient and fixes most of the freezing but not all of it. Sometimes you'll have random moments where it'll freeze even if you've done everything right. What you do is activate PAL mode, which drops the max frame rate from 60 per second to 50 per second. There appears to be some instability caused by the 60 frame rate. Switching from 60 to 50 basically plays the Mario RPG like it's the Japanese version speed. That's all it does but it fixes some freezes.

1) Load the game

2) When the game is loaded, press "Esc" found in the upper left corner of your keyboard

3) Choose "Load"

4) In the lower right portion of the new menu, select the grey box next to "PAL"

5) In the black box you should search for "Super Mario RPG Legend of the Seven Stars"

6) Choose "Load" found in the bottom right

7) Continue your game from any save state or save

*Every time you close and reopen this game, you'll need to switch to PAL mode. The emulator doesn't remember your PAL settings and I don't know why.

https://www.vizzed.com/playonlinegames/game.php?id=8613&page=user-videos&video=wuuCuZY4YH0#user-videos

Slowness Fix
There isn't a fix-all solution here either. If you close the Vizzed website while you're playing the game, you will have less random slow-downs. Using less computer resources helps to make the game run faster so close all background programs you don't need or aren't using.

Contribute
If you need help or if you have a solution for a fix, please feel free to post below. If you find any solution, please post it! Everyone should be able to play this amazing game. Thanks!