Site is slow when submitting an Advertisement

Hello

My site becomes super slow, while an advertisement is being submitted. To be precise, the site speed is normal until the image upload. Once the "Post an Ad" button is clicked, it becomes super slow.

Also, the site becomes super slow whenever an advertisement status is changed to "Active" from admin area. After few minutes, getting "SQL Error..." popup message and the advertisement gets published.

Anyone experienced / experiencing this issue?

Flynax team... any help would be appreciated.