ui: wrap whole _write() block with timeblockedsection I think the cost of color labeling is negligible compared to the I/O syscalls. Let's simply wrap the whole write() function so that we can eliminate _write() and _write_err() in later changeset.

ui: indent _writenobuf() to prepare moving bits from _write() functions

ui: simply concatenate messages before applying color labels This should be cheaper in space than applying labels for each message.