Integer  loops = 1000;
Datetime stime, etime; // Start time, end time
String   results = '';

void logtime(String msg) {
    results += '\n' + msg + ': ' + (etime.getTime() - stime.getTime()) + ' ms';
}

// Repeat for each strategy
stime = System.now();
for (Integer i=0; i<loops; i++) {
    // Write strategy here
}
etime = System.now();
logtime('Your strategy');

System.debug(results);