I will take a look at those figures to work out what happened. Does that mean when coin join reaches a latter part (around 80-90% upwards), it is better to not further coin join as only a small amount remains and it is better to use/move the already parts of the private funds before proceeding further and only after further funds have been added?
The next time I use Ginger Wallet I will change the default co-ordinator to Open Co-ordinator because they charge zero percent fees therefore all that should be deducted is the mining fee. The time it takes to reach 100% privacy will be a key comparator the time Ginger Wallet took.
Both Wasabi and Ginger clients aim to avoid generating 'change.' In other words, all coins should be consolidated into specific denominations (those values that are generated by all clients). This means the difference should stay below a certain minimum output amount, which is set at 10,000 satoshis for Ginger. (It’s widely believed that change negatively impacts privacy). However, this can become a significant issue if the client can only participate with low-value coins.
If only a small amount of money remains, it’s advised not to coinjoin (this applies to all clients), as you'll lose an average of 3-5k satoshis per round on top of the mining fee. There's almost certainly no coordinator fee involved.
The mining fee can be calculated, but in an environment with a rate of 3-4 sat/vbyte, it shouldn't be a major expense by itself. The vbyte is roughly 70 times the size of the input coin and 30 times the size of the output coin, and you multiply this by the mining fee. At a rate of 4 satoshis, the cost will be around 3,000-4,000 satoshis (independent of the client, assuming an average number of input/output coins).
You can always check your coins and their privacy level at the wallet's coin list or at the coinjoin bar. At opencoordinator you will also lose the "change" money, this is a client thing, not a server side thing. The client decides not to create change.
Also please consider using the Ginger Wallet directly, it can be installed parallel to Wasabi, has slightly different coinjoin solutions. Only one can run at a time though.
Also don't forget that we will have a free weekend.
