You could try restarting your macbook and closing any unused apps or browser tabs to free up resources. If it's still the same, it might be worth trying Safari to see if performance is any better there.
There's actually a hidden mechanic that gradually increases your odds of hitting the jackpot within a single session (only if you haven't landed one before). So it's best to save up a large amount of Quartz and try to spin for the jackpot all in one go without refreshing or closing the game in between.
I got the turtle and reached ocean with it on first try!! Took total of 1590 quartz :)
One more suggestion for you.. In furnace you can add a 5+ or 10+ or put all or the ores/coal option because clicking on it multiple times gets annoying.
And once again hats off to you what a brilliant game. I really love how detailed it is. Time to 100% the game!
Congrats on reaching the ocean with Reeler on your first try!
For the furnace, you can actually hold down the + button to add ores or fuel more quickly. I didn't add extra buttons like +5 or +All mostly because of space constraints, and I try to keep the UI clean and uncluttered.
Thanks again! All the best on your journey to 100%!