Is this correct usage of english-Thanks for a still quicker reply?

The phrase "Thanks for a still quicker reply" is grammatically correct, but it's a bit awkward.

Here's why:

* "Still quicker" is redundant. "Quicker" already implies a comparison to something else, so "still" adds unnecessary emphasis.

* "Quicker reply" could be improved. It's a bit vague.

Here are some better ways to phrase it:

* "Thanks for the even faster reply!" (More direct and enthusiastic)

* "Thanks for responding so quickly!" (Simple and effective)

* "I appreciate your swift response!" (More formal and appreciative)

Ultimately, the best choice will depend on the context and your desired tone.