AKAMAI TECHNOLOGIES, INC. Performance-Based Restricted Stock Unit Agreement Granted Under the 2009 Stock Incentive Plan

Exhibit 10.5

AKAMAI TECHNOLOGIES, INC.

Performance-Based Restricted Stock Unit Agreement

Granted Under the 2009 Stock Incentive Plan

This Agreement evidences the grant by Akamai Technologies, Inc., a Delaware corporation (the “Company”) on             , 2009 (the “Grant Date”) to you (the “Participant”) of restricted stock units of the Company (individually, an “RSU” and collectively, the “RSUs”), subject to the terms and conditions set forth in this Restricted Stock Unit Agreement (the “Agreement”) and the Company’s 2009 Stock Incentive Plan (the “Plan”). Each RSU represents the right to receive one share of the common stock, par value $.01 per share, of the Company (“Common Stock”) as provided in this Agreement. The minimum number of shares issuable is zero; the maximum number of shares issuable is equal to 50% of the number of shares issued on the Grant Date under the terms of the other Restricted Stock Unit Agreement that subsequently vest (the maximum number of RSUs issuable hereunder, the “Maximum RSU Bonus Award”). The shares of Common Stock that are issuable upon vesting of the RSUs are referred to in this Agreement as “Shares.” Capitalized terms used but not defined in this Agreement shall have the meanings specified in the Plan.

(a) Subject to the terms and conditions of this Agreement including, without limitation, Paragraph 2(c) below, this award shall vest on the 2011 Reporting Date if, and to the extent that, the Company achieves the financial performance criteria set forth in Schedule 1 to this Agreement. Such date or any other date on which shares vest under this Agreement may be referred to herein as a “Vesting Date.”

(b) The “2011 Reporting Date” shall mean the date on which the Company files its annual Public Company Financial Statements for fiscal year 2011 or completes its annual Private Company Financial Statements for fiscal year 2011, as applicable. If, on December 31, 2011, the Company is required to make periodic reports under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), the Company’s consolidated financial statements filed with the Securities and Exchange Commission on Form 10-K shall constitute its “Public Company Financial Statements” and shall apply. If, on December 31, 2011, the Company is not required to make periodic reports under the Exchange Act, the Company’s regularly prepared annual audited financial statements prepared by management shall be its “Private Company Financial Statements” and shall apply. The applicable financial statements may be referred to herein as the “2011 Financial Statements.”

(c) Except as otherwise provided in this Section 2, RSUs shall not continue to vest unless the Participant is, and has been at all times since the Grant Date, an employee, officer or director of, or consultant or advisor to, the Company. For purposes of this Agreement, employment with the Company shall include employment with a parent, subsidiary, affiliate or division of the Company.

(d) If the Participant dies or becomes disabled on or after January 1, 2012 but before the 2011 Reporting Date, he or she shall be deemed to have been employed as of the 2011 Reporting Date.

(a) The Company will distribute to the Participant (or to the Participant’s estate in the event that his or her death occurs on or after January 1, 2012) the Shares of Common Stock represented by vested RSUs as follows: within 30 days of the Vesting Date; provided that if the Participant vests as the result of the application of Section 2(d), the earlier of 30 days after the 2011 Reporting Date or March 15, 2012.

(b) The Company shall not be obligated to issue to the Participant the Shares upon the vesting of any RSU (or otherwise) unless the issuance and delivery of such Shares shall comply with all relevant provisions of law and other legal requirements including, without limitation, any applicable federal or state securities laws and the requirements of any stock exchange upon which shares of Common Stock may then be listed.

(c) Neither the Company nor the Participant shall have the right to accelerate or defer the deliver of any shares under this Agreement except to the extent specifically permitted under Section 409A of the Internal Revenue Code of 1986, as amended.

The Participant shall not sell, assign, transfer, pledge, hypothecate or otherwise dispose of, by operation of law or otherwise (collectively “transfer”) any RSUs, or any interest therein, except by will or the laws of descent and distribution.

Except as set forth in the Plan, neither the Participant nor any person claiming under or through the Participant shall be, or have any rights or privileges of, a stockholder of the Company in respect of the Shares issuable pursuant to the RSUs granted hereunder until the Shares have been delivered to the Participant.

(a) This Agreement is subject to the provisions of the Plan, a copy of which is made available to the Participant with this Agreement.

(b) Upon the occurrence of an Acquisition Event (as defined in the Plan), each RSU (whether vested or unvested) shall inure to the benefit of the Company’s successor and shall apply to the cash, securities or other property which the Common Stock was converted into or exchanged for pursuant to such Acquisition Event in the same manner and to the same extent as they applied to the Common Stock subject to such RSU.

(c) Upon the occurrence of a Change in Control Event (regardless of whether such event also constitutes an Acquisition Event), vesting of each RSU shall be determined in accordance with the provisions of Schedule 1 to this Agreement.

(a) Regardless of any action the Company or the Participant’s employer (“Employer”) takes with respect to any or all income tax, social insurance, payroll tax, payment on account or other tax-related withholding (“Tax-Related Items”), the Participant acknowledges that the ultimate liability for all Tax-Related Items legally due by him or her is and remains the Participant’s responsibility and that the Company and/or the Employer (1) make no representations or undertakings

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regarding the treatment of any Tax-Related Items in connection with any aspect of the Restricted Stock Unit award, including the grant and vesting of the Restricted Stock Units, the receipt of cash or any dividends or dividend equivalents; and (2) do not commit to structure the terms of the award or any aspect of the Restricted Stock Units to reduce or eliminate the Participant’s liability for Tax-Related Items.

(b) In the event that the Company, subsidiary, affiliate or division is required to withhold any Tax-Related Items as a result of the award or vesting of the Restricted Stock Units, or the receipt of cash or any dividends or dividend equivalents, the Participant shall pay or make adequate arrangements satisfactory to the Company, subsidiary, affiliate or division to satisfy all withholding and payment on account obligations of the Company, subsidiary, affiliate or division. The obligations of the Company under this Agreement, including the delivery of shares upon vesting, shall be conditioned on compliance by the Participant with this Section 7. In this regard, the Participant authorizes the Company and/or the Employer to withhold all applicable Tax-Related Items legally payable by the Participant from his or her wages or other cash compensation paid to the Participant by the Company and/or the Employer. Alternatively, or in addition, if permissible under local law, the Company may withhold in shares of Common Stock an amount of shares sufficient to cover the Participant’s tax liability.

(c) The Participant will pay to the Company or the Employer any amount of Tax-Related Items that the Company or the Employer may be required to withhold as a result of the Participant’s participation in the Plan or the Participant’s award that cannot be satisfied by the means previously described.

(d) As a condition to receiving any Shares, on the date of this Agreement, Participant must execute the Irrevocable Standing Order to Sell Shares attached hereto, which authorizes the Company and Charles Schwab & Co., Inc. (or such substitute brokerage firm as is contracted to manage the Company’s employee equity award program, the “Broker”) to take the actions described in Section 7(b) and this Section 7(d) (the “Standing Order”).

(e) Participant understands and agrees that the number of Shares that the Broker will sell will be based on the closing price of the Common Stock on the last trading day before the applicable Vesting Date. The Participant agrees to execute and deliver such documents, instruments and certificates as may reasonably be required in connection with the sale of the Shares pursuant to this Section 7.

(f) Participant agrees that the proceeds received from the sale of Shares pursuant to Section 7(d) will be used to satisfy the Tax-Related Items and, accordingly, Participant hereby authorizes the Broker to pay such proceeds to the Company for such purpose. Participant understands that to the extent that the proceeds obtained by such sale exceed the amount necessary to satisfy the Tax-Related Items, such excess proceeds shall be deposited into the Participants account with Broker. Participant further understands that any remaining Shares shall be deposited into such account.

(g) The Participant represents to the Company that, as of the date hereof, he is not aware of any material nonpublic information about the Company or the Common Stock. The Participant and the Company have structured this Agreement to constitute a “binding contract” relating to the sale of Common Stock pursuant to this Section 7, consistent with the affirmative defense to liability under Section 10(b) of the Securities Exchange Act of 1934 under Rule 10b5-1(c) promulgated under such Act.

(a) No Rights to Employment . The Participant acknowledges and agrees that the vesting of the RSUs pursuant to Section 2 hereof is earned only by continuing service as an employee at the will of the Company (not through the act of being hired or purchasing shares hereunder). The Participant further acknowledges and agrees that the transactions contemplated hereunder and the vesting schedule set forth herein do not constitute an express or implied promise of continued engagement as an employee or consultant for the vesting period, for any period, or at all.

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(b) Severability . The invalidity or unenforceability of any provision of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement, and each other provision of this Agreement shall be severable and enforceable to the extent permitted by law.

(c) Waiver . Any provision for the benefit of the Company contained in this Agreement may be waived, either generally or in any particular instance, by the Board of Directors of the Company.

(d) Binding Effect . This Agreement shall be binding upon and inure to the benef