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                                                      EXHIBIT 10.10 - AS AMENDED

                                    EXTENSION
                                       TO
                               SUBLEASE AGREEMENT

         THIS EXTENSION TO SUBLEASE AGREEMENT, dated as of this 20th day of
October, 2000, by and between Vortex Enterprises LLC ("Vortex"), a New York
limited liability company and successor in interest to C&J Enterprises, having
an office at 3002 East Avenue, Rochester, New York 14610 and Performance
Technologies, Incorporated ("PTI"), a Delaware corporation having an office at
315 Science Parkway, Rochester, New York 14620.

                                    RECITALS
                                    --------

         Vortex and PTI entered into that certain Sublease Agreement as of
September 1, 1990 pursuant to which PTI agreed to lease from Vortex the Premises
as defined in the Sublease Agreement.

         Pursuant to Amendment to Sublease Agreement dated as of December 1st,
1998 (the "Amendment"), Vortex and PTI amended the Sublease Agreement by
canceling the provisions of Section 4 of the Sublease Agreement and
acknowledging that, except as modified by the Amendment, the Sublease Agreement
should remain in full force and effect.

         The Sublease Agreement terminates May 31, 2001, and PTI desires to
extend its occupancy for an additional six months upon the terms and conditions
set forth in this Extension to Sublease Agreement.

         Vortex and PTI hereby agree as follows:

     1.  The Term of the Sublease Agreement, as amended, shall be extended to
         November 30, 2001 upon the same terms and conditions set forth in the
         Sublease Agreement as amended by the Amendment; provided, however, that
         the rent for such six-month period shall be adjusted as of June 1,
         2001, in accordance with the provisions of Section 3.2 of the Sublease
         Agreement.

     2.  The Sublease Agreement, as modified by the Amendment, and as extended
         by this Extension to Sublease Agreement shall remain in full force and
         effect.

     IN WITNESS WHEREOF, the parties hereto have signed this Extension to
Sublease Agreement as of the day and year first written above.

                                                 VORTEX ENTERPRISES LLC

                                                 By:/s/Charles E. Maginness
                                                    ----------------------------
                                                    Charles E. Maginness


                                                 By:/s/John M. Slusser
                                                    ----------------------------
                                                    John M. Slusser


                                                 PERFORMANCE TECHNOLOGIES, INC.

                                                 By:/s/Donald L. Turrell
                                                    ----------------------------
                                                    Donald L. Turrell, President