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---
title: Michael Abrash's Graphics Programming Black Book, Special Edition
author: Michael Abrash
date: '1997-07-01'
isbn: '1576101746'
publisher: The Coriolis Group
category: 'Web and Software Development: Game Development,Web and Software Development:
Graphics and Multimedia Development'
chapter: '04'
pages: 106-109
---
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![](images/i.jpg) *A line-drawing subroutine, which executes perhaps a dozen instructions for each display memory access, generally loses less performance to the display adapter cycle-eater than does a block-copy or scrolling subroutine that uses **REP MOVS** instructions. Scaled and three-dimensional graphics, which spend a great deal of time performing calculations (often using very slow floating-point arithmetic), tend to suffer less.*
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