Indexing Service is using to index entire your file on all of your drives. And the result from index progress will use by search facility. And it will give you accuracy when you search a file but unfortunately Indexing Service makes your computer be slower. Because Indexing Service will run on background and using your computer resources big enough. And if you is very rare using Search feature, just turning Indexing Service off.

To turn Indexing Service off, just manage it on Service manager window. You can read my article about how do to disable Windows Service first.
1. Open Service manager first, by click Start -> Control Panel -> Administrative Tools -> Services.

2. Find Indexing Service item on list.

3. Double click it, change Startup type to Disable, click Stop button and then click OK button.

4. And Windows will turn off the Indexing progress directly and you get your more computer resource.
(article no:0134)