Reading bzipped files

[via Digitalmars-d-learn]

On Monday, 4 May 2015 at 20:53:27 UTC, monty wrote:
> cool. btw (at least GzipByLine) its sloooow if you compare it 
> to gzcat and pipe it into stdin and use ByLineFast.
> i think its mainly the buffer appending that  suboptimal.

Could anyone please point out if this is possible to fix somehow? 
Is the solution to avoid the GC and do buffer reuse somehow?