Was Lord Krishna Against Vedic Yagna Rituals? Comments

In Bhagavad Geeta chapter II verse 42 and 43 Bhagwan Krishna speaks as if belittling the Vedic rituals associated with Yagna.
Yagna was an important part of Vedic way of life. Why would Krishna speak so harshly against it? I wondered! All of a sudden another question came to mind; did Krishna ever performed a Yagna?

As I turned to internet for my research I was surprised to find few facts, unknown to me or lost in memory!
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