Best way to make make expdp/impdp faster

 EXPDP
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=> Give more parallel as per allocated CPU
=> Exclude stats 
IMPDP
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=> create SQL file for Triggers and Indexes and modify parallel 1 to "parallel *" (as per your CPU)
=> Import metadata only (exclude index,stats)
=> Generate script to disable PK,FK constraints ( Do not generate script for check constraint)
=> Disable PK,FK constraints ( Do not disable check constraint)
=> import data_only ( parallel depends on CPU and dump files)
=> Create index and trigger in parallel (this will generate PK index also)
=> enable PK and FK constraints 
=> gather stats (or import stats)