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#30985 caused `object.save` performance regression since calling
`changes` in `changes_applied` is very slow.
We don't need to call the expensive method in `changes_applied` as long
as `@attributes` is tracked by mutation tracker.
https://gist.github.com/kamipo/1a9f4f3891803b914fc72ede98268aa2
Before:
```
Warming up --------------------------------------
create_string_columns
73.000 i/100ms
Calculating -------------------------------------
create_string_columns
722.256 (± 5.8%) i/s - 3.650k in 5.073031s
```
After:
```
Warming up --------------------------------------
create_string_columns
96.000 i/100ms
Calculating -------------------------------------
create_string_columns
950.224 (± 7.7%) i/s - 4.800k in 5.084837s
```
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