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Most probably, your setting is overruled later.

or depending on the speed settings for specific setting/sensors (ENABLED(SLOWER_PROBE_MOVES) || ENABLED(TH3D_EZ300) || ENABLED(TIM_AM8)):

or depending on the speed settings for specific setting/sensors (ENABLED(SLOWER_PROBE_MOVES) || ENABLED(TH3D_EZ300) || ENABLED(TIM_AM8):

In Marlin you would simply change the value of the travel between probing speed whilst in TH3D you need to sort out if one of all those conditions are met. For advanced users with a slightly different printer setup, the TH3D software might be less optimal. Do note that forks of the Marlin firmware that are heavily modified always (like TH3D) lack behind the original sources; you are dependent on the implementation schedule of the fork maintainer. But, for people that have not modified their printer, have a limited knowledge of software (C/C++ development) and firmware flashing, or their modification falls in the supported options of TH3D, the monolithic TH3D might be very helpful!

or depending on the speed settings for specific sensors:

// If you have issues with your machine running the faster probe setting disable the #define EZABL_FASTPROBE below.
// DO NOTE: Most machines will work with the fast probe enabled. Use M48 to verify accuracy.
#define EZABL_FASTPROBE

// Superfast probing - Only works with the EZABL Pro Sensors
// DO NOTE: Not all machines will work with the fast probe enabled. Use M48 to verify accuracy and make sure the Z isn't binding with the high speeds.
//#define EZABL_SUPERFASTPROBE

or depending on the speed settings for specific setting/sensors (ENABLED(SLOWER_PROBE_MOVES) || ENABLED(TH3D_EZ300) || ENABLED(TIM_AM8)):

// If you have issues with your machine running the faster probe setting disable the #define EZABL_FASTPROBE below.
// DO NOTE: Most machines will work with the fast probe enabled. Use M48 to verify accuracy.
#define EZABL_FASTPROBE

// Superfast probing - Only works with the EZABL Pro Sensors
// DO NOTE: Not all machines will work with the fast probe enabled. Use M48 to verify accuracy and make sure the Z isn't binding with the high speeds.
//#define EZABL_SUPERFASTPROBE

Basically, if you have not defined one of the following: PROBING_MOTORS_OFF, SLOWER_PROBE_MOVES, TH3D_EZ300 or TIM_AM8, the XY_PROBE_SPEED will default to a value of 4000 (depending of the definition of HOMING_FEEDRATE_XY) since the constant is not defined, see Conditionals_post.h):

  #ifndef XY_PROBE_SPEED
    #ifdef HOMING_FEEDRATE_XY
      #define XY_PROBE_SPEED HOMING_FEEDRATE_XY
    #else
      #define XY_PROBE_SPEED 4000
    #endif
  #endif