Why immigration process is slow down?

Because there are more applicants than there are visas.

221G (H1 renewal) in Toronto, can I get stamping done in India after admin review is completed?

Yes, you would have to travel back to Toronto for the visa stamping. Otherwise you would have to start the visa stamp application process all over...

My h1b got denied recently...Can i apply for another H1b from other company if yes within how many days i can do so.

Yes you can apply for another H-1B immediately. Whether your status is changed/extended depends on whether your I-94 has expired. What would be...

What is the difference between I-864 and I-134

The I-864 is required for family based petitions. The I-134 is usually used for employment based petitions for the derivative immigrants.

I am a us citizen and got married to alien with valid passport and birth certified

You would file the I-130 and your spouse would file the I-485 as per the USCIS form instructions.

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H1B Visa Stamping in Canada

A single entry visa means that you can only make one entry into the US, period. It does not matter what country you are coming from.

Regarding my education as my visa is getting expired

You should be able to continue your studies with L-2 status.

How to withdraw H1 case pending for admin review (yellow 221G)

A lot depends on the reasons for the admin review. You should retain an experienced immigration attorney to review the case and advise you...

HOW LONG DOES IT TAKE IF I SUBMITT PAPERS FOR MY SON IF I'AM A RESIDENT, HE LIVES IN EL SALVADOR, AND IS 28 YEARS OLD

Please read http://www.kassj.com/netiquette/netiquette.html

My h1b got denial can i go for student visa while staying in us

If your I-94 has not expired, then yes, but you will have to justify your studies.