Throttling is a new feature in SharePoint 2010 lists. It allows SharePoint administrators to impose limits on the number of items returned by list queries from a list.

Now we will see this setting step-by-step.

Open the SharePoint 2010 Central Administration website.

application management
Image 1.

Click here Application Management.

manage web application
Image 2.

Click Manage web applications here.

Manage Web application here
Image 3.

Select your SharePoint site then click on General Settings then click on Resource Throttling.
It may be a you can get the following screen after clicking here.

Click on Resource Throttling
Image 4.

No need to worry. Use the following procedure.

Open SharePoint 2010 Management PowerShell and use the following code:

$w = get-spwebapplication http://Site_URL
$w.HttpThrottleSettings
$w.Update()

Now again select your SharePoint site then click on General Settings then click on Resource Throttling.

Resource Throttling
Image 5.

General Setting
Image 6.

backword compatible
Image 7.

Do the settings as you want.

The following is the description of all settings: