Launch MAMP Pro.

Go to File | Edit Template | PHP | 5.3.6 (your version may be different. It's the 5.3 that's the important part, not the last number):

On the left-hand side of the text editor are line numbers. Around line 230, you'll find three lines: max_execution_time, max_input_time, and memory_limit. Change their values as follows:

max_execution_time = 999;
max_input_time = 999;
memory_limit = 256M;

Save and close the file after altering the values.

Go to File | Edit Template | MySQL my.cnf.

As shown in the preceding screenshot, raise the max_allowed_packet size to 32M, raise the net_buffer_length, read_buffer_size, and read_rnd_buffer_size each to 2048K. Save and close the file.

Using the red button at the top right of the MAMP window, stop and start the server's services.

Navigate again to http://dpk.local/info.php. Look for the memory_limit value on the page. It should be the same as the value you set in step 3, 256M.