The biggest and most pressing issue wrt compilation speed is the unfinished 
`--symbolFiles` feature. "symbolfiles" has become my term for "incremental 
compilation", its latest incarnation uses a database to store intermediate 
compilation fragments on a module granularity. Only modules that have changed 
since the last compilation should be recompiled. C++'s module feature is not 
gonna help us, since we got signature hashing most time is spent in the Nim 
frontend. 

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