Printer and non-transitory computer-readable medium

A non-transitory computer-readable medium storing computer-readable instructions that, when executed by a processor of a printer, cause the printer to perform the steps of:

• specifying numbers of ON dots for at least a first specified block and a second specified block among a plurality of lines that make up a printed pattern, the first specified block being one of a plurality of blocks, each of the plurality of blocks including a first specified number of lines, the second specified block being another of the plurality of blocks and including a line to be printed before the first specified block, and the number of ON dots being a number of heating elements, among a plurality of heating elements of the printer, to be operated when the printing of one line is performed;
• specifying first speeds that respectively correspond to at least the first specified block and the second specified block based on the numbers of ON dots;
• setting a second speed based on the first speeds that respectively correspond to the first specified block and the second specified block, such that a printing medium is fed by a feeding portion at the first speed for the first specified block when the printing of the first specified block is performed by a printing portion, the second speed being a feed speed of the printing medium fed by the feeding portion when the printing of the second specified block is performed by the printing portion, the setting of the second speed being such that the printing of the first specified block is performed on the printing medium fed at the first speed immediately after the feeding portion has changed the feed speed from the second speed to the first speed in accordance with a specified rate of change the feeding portion being configured to feed the printing medium in an auxiliary scanning direction and being able to change the feed speed for the printing medium at the specified rate of change, the printing portion comprising the plurality of heating elements arrayed in a main scanning direction and configured to perform printing of one line at a time on the printing medium fed in the auxiliary scanning direction by the feeding portion, the one line extending in the main scanning direction, and the main scanning direction being orthogonal to the auxiliary scanning direction;
• and
• controlling the feeding portion and the printing portion such that the printing medium is fed by the feeding portion at the second speed when the printing of the second specified block is performed by the printing portion, and such that the feed speed is adjusted to the first speed just one line before a specified line is printed.