Turn on Manual Indexing

Manual Index Mode - Magento Increase Admin Performance

In default Magento installation, admin area is particularly slow. The reason for this is that admin area can’t use much cache and more database operations. After adding products it becomes even slower. Modifying or adding a new products becomes very slow.

As with most Magento settings, this can be done in the Magento admin panel or the Command Line

Setting Indexing to Manual Mode - Via Control Panel

System -> Index Management -> Select Indexes to change(select all) -> Change Index Mode -> Manual Update -> Click Submit