And when you have a look at the graph you’ll also notice some transactions using a fee way too high… They had sent their transaction with more than 100 satoshi / bytes, although a fee of only 2 satoshi / byte would have been enough to get the transaction into the next block. ^^
the values on this chart are aggregated size not the size at that s/b value. meaning when you see 0.294 MB in front of 2+ it means there are 0.294 MB transaction that pay a fee of 2, 2.1, 2.11,... 2.2, 3, ...,4... and so on fee. so when you see it says 0.556 MB in front of 1 s/b then it means if you had paid 1 satoshi/byte fee or less your transaction would have been confirmed in the next block. and
2 was overpay.Yes, finally I have paid 1 sat/byte more for my transaction than required.
But it's not known while sending a transaction, when a new block will be found. It's possible that the block will be found 1 minute later or 20 minutes later. And in the meantime, the size of the mempool can increase especially with transactions paying more sat/byte than my transaction so that they will be included in a new block first.
So, I tend to set always 1 or 2 sat/byte more when in doubt. That's not much $ (also depending on the size of the transaction) but will increase the possibility to get the transaction into the next block.
If it is Electrum, you don't have to use that online chart.
That "mempool size in MB" chart is basically the same as Electrum's fee estimation (mempool setting) slider.
Yes, it's a nice tool and much better than the other two (Static / ETA). However, it's always useful to have a look at the Mempool to get an impression about the overall situation (a few hours) before. (If there are many transactions incoming or the mempool is getting emptier step by step.
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