extra Time period added during debug

1 . When I debug a code,& suppose at some place breakpoint is added, now again after this breakpoint ,an Ulink2 took adds extra around 20ms to start execute next inst.. Is it internal processing of Ulink2 processor took to start again after breakpoint.

Like :

Statement 1:
Statement 2:
Statement 3: // breakpoint at statement 4.
Statement 4: // on running again from stat 4 it adds extra 20ms.

2. Where to find debug/release settings of keil

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