[TYPO3-english] Fatal error problem

[harishathreya .]

Hi,
 Our customer has shifted to a new ISP some days ago nad since then we are
getting this error time and again
*Fatal error: Out of memory (allocated 6553600) (tried to allocate 77824
bytes)*

Our customer is an employee engagement company which hosts few competitions
for its customers... sometimes nearly 2000-3000 people may hit on one single
page at a time. Is this a problem to stay? Please help me find a solution

Thanks,
Harish