hi guys . i recently have changed my dns to another to speed up my site . but it doesn't seem that any thing have happened . i want to know does it really impact speed ? (i mean changing dns ? )
appreciate in advance .

Errr... You changed what to what? A few more details might help people answer.

i want to know does it really impact speed

No.

Well, it might improve the look up time. ...

... by a few milliseconds ...

.... Once. ...




... Every four days (or so)

Very unlikely to see any significant difference.

Unless you were with an exceptionally poor DNS provider and moved to an exceptionally good new one.

In reality, next to no difference.

It got the effect just that it not the first concern to speed up your website . You might need better hosting or CDN to faster your site loading

depends what dns service you use. I assume you've changed your modem DNS to a different DNS (not provided by your ISP). I also sumtime found my ISP dns is lousy, so I always change to OpenDNS its free DNS service and the dns server are 208.67.222.222 and 208.67.220.220

It does impact speed in the sense that the service resolve dns properly and is more updated.