Speed when pulling data from database

[buddhi225]

Hi,
I have created an offline system which normally runs very quickly.
But when it comes to displaying more and more information in a table it starts slowing down.

Eg. Only 1 item gets displayed. People can click + or - images and it adds an addition # of item 1. (still only 1 record showing)

As people add more items, (item 2, 3, 4, 5) it now shows 5 items in the table. When people click + or - images it now slows down. It seems sluggish.

When people click + and - it changes database entry and then redirects them. When it redraws the new page it responds slower (people cant spam click + and - anymore)
Is there anyway to display the items in the table faster? or to speed up the page creation?

I think I know one way I can change it but I'm not sure about the code. At the moment its split between 2 functions. Pulling data from 2 database tables.

This is how I pull data from the database. How do I pull from multi tables in same SELECT?

$sql_text = "SELECT id, minsize, maxsize FROM ".$this->TABLES[$type]." WHERE id = '$unitid' ORDER BY id"; 

By making this 1 function would it speed everything up?

[X-reX]

are the + and - buttons functioning as changing the picture located in the database in order to change its size?

Actually its a little hard to understand what the system does. Can you post a link to it here? or duplicate it just for the matter of the thread, and post a link to the other?