I want to know if it’s normal for an SSD to run at this speed because I saw a YouTube test where they showed the disk speed being 2600 MB/s for both reading and writing. But my speed is: Write 1400MB/s and Read 2600MB/s.
Additionally, I have another concern: I just bought a new MacBook Pro yesterday, but I noticed that my battery health is at 97% after only three charge cycles.
It’s hard to say whether the results are healthy or not. The speed of an SSD can vary due to several factors.
When writing data, SSDs need to do some preparation before the actual write operation, which is slower than reading.
As long as it doesn’t hinder your use, don’t mind it too much. 
Different SSDs will perform differently. Simply put, if you change to another test app, the results will be different.
But for your new MacBook, the power percentage is not normal 
, you’d better ask customer service or Apple Service.
Oh, it’s important to be cautious about information found online. Unless you know all the details about the test setup and conditions, the data might not be entirely accurate or relevant.
If you feel your Mac is too slow, why not clear junk files on Mac or detect some errors on it?
Maybe the video makes me nervous, I’m thinking too much but in fact, there is nothing wrong with my Mac. And I will ask the staff for the power question. Thank you 