will not
1 plug bar only provides working voltage for the mobile phone charger, which will not affect the working efficiency of the charger, nor reduce the charging speed.
2 The charging speed of the mobile phone depends on the mobile phone support related fast charge protocol parameters are related to the charger output current parameters, the faster the current output of the mobile phone charger, the faster the charging speed, the higher the mobile phone battery support fast charge protocol parameters, the faster the charging speed, so the plug bar will not affect the charging speed