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Before. Drilling, filing, etc are all done before heat treatment.
That said, for some things, where I need a very gentle taper, or mild profile changes, I do those after heat treatment. Because...

In that aspect too, it depends a bit what you are doing and why :D. But when using plain carbon steel like 1084 and use a forge to heat treat, I have found that the rest can have its final shape. In...

Beginners often make the mistake of quenching when the steel is dull red.
In reality it is closer to a soft orange.
when you look at the steel color change, you will at first see it starting to...

There are many good types of steel for razors.
And in part, it depends on what you can get easily.
In europe, 10x steel is not that common. Otoh, O2 is very common, which is impossible to get in...