To avoid duplicating replies, please create a brief one containing the most important recommendations and suggestions, and ask users to read it first before making new review.


* At first I tried to access the site without javascript, unfortunately the site does not work.

Suggestion:

Create a clean copy (e.g https://clean.whirlwind.money/) with basic features that do not require JavaScript.

** Fast Mode: The idea of delaying a transaction to enhance privacy is relatively old and has proven to be traceable.

Suggestions:

Why don't you try to do some off-network transactions using, for example, nonymous LN hub or somthing like:
 - TumbleBit: An Untrusted Bitcoin-Compatible Anonymous Payment Hub: https://github.com/BUSEC/TumbleBit
 - A²L: Anonymous Atomic Locks for Scalability in Payment Channel Hubs

*** Note fees: I see that you give a variable range of note fees, and the reason is to enhance privacy. Humans use the same choice when they have multiple options.

Suggestions:

 that the notes fee be random at any rate from 0.25% to 1.5%.

**** Warranty message: I see that the warranty message contains "We have generated the deposit address," without a clear definition of the service name.

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I will test mixing process using the coins that will be sent here:

Btc add: bc1q64zq37ww5ls3xz8nylu8jjkmadvgzm3vjpfef4 (new address)