Each PHP process is limited to memory_limit amount of memory.
A Shared Single package has a PHP memory_limit set to 128 MB by default, a Premium package has 256MB and Business - 512MB.
Cloud Startup package has a PHP memory_limit set to 1024 MB, Professional package has 2048 MB and Global - 4096 MB 💪
If you wish to increase your memory limit, you can upgrade your plan.
Notes: