Lock time is measured in MILLIseconds (thousandths of a second)....NOT MICROseconds (millionths of a second). Even the slowest actions of all, such as old milsurps like Mausers, Mosin Nagants, etc. still have lock times of less than a 1/100 of a second.
Nevertheless, as kraigwy said, you should concentrate on shooting fundamentals.....and forget about lock time. For anything other than open class, long range target shooting, it doesn't really matter.