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    f4abff4f
    Use a single memmove() when moving the entire width. · f4abff4f
    Deucе authored 
    When fast scrolling, memmove() takes most of the CPU by far... it
is likely actually worth having each line be a buffer of its own
and just moving the pointers around.  To help with this optimization
in the future, move the screen memmove() bit into a separate function.
    f4abff4f
    Use a single memmove() when moving the entire width.
    Deucе authored 
    When fast scrolling, memmove() takes most of the CPU by far... it
is likely actually worth having each line be a buffer of its own
and just moving the pointers around.  To help with this optimization
in the future, move the screen memmove() bit into a separate function.