There are a few steps to this method.
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Get around 25k. You can do this as fast as you want it.
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Get an alt or a friend to be right next to you.
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Reload the page.
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Help your friend/alt get back to 25k.
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Get the friend/alt to reload the page.
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Repeat.
Here are the numbers to back it up:
Let’s assume it takes 45 seconds to get 1k. If so, then you get 5k (coins dropped is 20k, to get to 25k you need 5k) in around 225 seconds, or 3 minutes and 45 seconds. With a cushion of 15 seconds, it takes you 4 minutes to get 25k. This means it would take a regular person (and their friend/alt) around 16 min to get 100k, discounting setup time for the original 25k.
Additionally, boss spawns could help boost the productivity of the method. Someone could find a boss, kill it, get their friend/alt to get the coins, die, and cycle back until they are at 20-25k. This would give you an easy additional 150k-200k each, depending on the boss.
This is a well-known method by the community, so I decided to help newer players with this guide. Thanks, and CYA!