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Movement speed while walking and running is measured in yards per second. In this case, a yard is defined as the distance between opposite corners of a sub-tile [1], into which the world surface is normally invisibly divided, like a chess board: a yard measures 32 pixels horizontally and 16 pixels vertically due to the game's isometric graphics.
Enlargement of a single sub-tile.
Consequently, the dimensions of the visible screen are as follows:
Resolution
Visible Area
Pixels
Yards
640 x 480
640 x 432
20 x 27.0
800 x 600
800 x 552
25 x 34.5
Relationship between movement speed yards and radius at 800 x 600 resolution.
Maximum limit is not normally reached (diminishing returns formula for skills reaches its ceiling at level 60). Both cold length and maximum Holy Freeze modifier are determined by player chill effectiveness (-50), and Slows Target has a -50 ceiling when applied to players.
While +100% movement speed doubles walk speed, it only does the same for run speed when base walk and run speeds are equal. Normally, base walk speed is 6 and base run speed is 9 yards per second, so +100% movement speed only increases run speed by 2/3 and +150% movement speed is required to double run speed, while -75% movement speed reduces walk speed to the floor and -125% does likewise for run speed. In either case, each percentage difference is 0.06 yards per second.