Serhiy Storchaka <> added the comment:

I just have merged a change which makes many C-style formatting as fast as 
f-strings (issue28307) and am working on supporting more format codes (%d, %x, 
%f, etc). Using C-style formatting can be a good option if you want performance 
and backward compatibility. It was faster than str.format() even without that 

nosy: +serhiy.storchaka

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