In my opinion, the defendant's attorney bears the primary responsibility of insuring that his client's right to a speedy trial is properly protected. A detailed review of the case would have to be performed to determine whether the defendant's right to a speedy trial has been denied and whether a motion should be made to dismiss the case pursuant to CPL 30.20 or 30.30. A defendant can waive his right to a speedy trial.
A defendant can, and often does, wind up waiving some speedy trial time. This is a very complex area of law. While speedy trial time on a felony is 6 months (90 days if the defendant is in jail) it is rare that the time will have run 6 months to the day after arrest. This is because the defendant will often consent to some adjournment time for purposes of plea negotiations, discovery or motions. To determine how much "chargeable time" has elapsed, requires a thorough review of the record of the proceedings to date.
Should you have any further questions, please do not hesitate to contact me at anytime.