Hot to? Joining/combining tables

[mamuka]

Hi everybody!
I have a problem with loading-time. I was sugested to reduse number of tables accessed simultaneously.
In my case (I have more than 3000 products and aprox. 300 categories) I just want to join/combine folowing tables:
categories+categories_description = categories [exluding same rows]
and
poducts+products_description = products

Partially I have allready join categories and categ._descr.
modifying following files:
admin/include/application_top.php
catalog/include/application_top.php
--------------------------------------------
I have change(replase)
define(table_categories_description) with (categories)

catalog/../general.php
cat./../header_tags.php
cat./index.php (default.php)
cat/../boxes/categories.php
-----------------------------------------

I have replase
". table_categories ." c, ". table_categories_description."


Now, the question.
Please tell me if it is enough or I need to do some additional changes, and where exactly.

If you have questions or I made myself not understandable - contact me at
mamuka@gmx.net

Regards