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I was watching a friend's Prusa run the bed-probe routine and I realized how pathetically slow mine is and takes forever. I want to speed it up.

What parameters in Marlin's Configuration.h do I modify? Also, it seems to retract for the second "accurate" probe by like 10 mm which could be reduced by 8 mm or so. Where is that one? I looked through but can't be sure. Also, could I just change the feedrate in the pre-script?

#define DEFAULT_MAX_FEEDRATE { 300, 300, 8, 50 }    // was { 400, 400, 8, 50 }
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To speed up the probing, a "High Speed" option is available in Configuration_adv.h which is by default disabled (//#define BLTOUCH_HS_MODE) as not all printers/sensors are able to use this.

You can also increase the homing speeds in your Configuration.h file.

// Homing speeds (mm/min)
#define HOMING_FEEDRATE_XY (50*60)
#define HOMING_FEEDRATE_Z  (4*60)

.
..
...
..
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// Feedrate (mm/min) for the first approach when double-probing (MULTIPLE_PROBING == 2)
#define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z

// Feedrate (mm/min) for the "accurate" probe of each point
#define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)

However, you can simply speed up the movement between probe locations by setting the movement speed directly through G-code. The G29 code, used for automatic probing of the bed surface is described in "G29 Auto Bed Leveling (Marlin - MK4duo)". The S parameter in G29 can be used to set the movement speed between probes, where the units are specified in "units/min", e.g. mm/min.

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