The source includes prayer in ordinary dirty or work garments when cleaner suitable clothing is available; praying bareheaded out of laziness, while genuine humility is expressly treated separately; praying when desired food is present and strongly occupies the mind; and any avoidable matter that seriously distracts the mind and damages Khushu.
If the prayer time is becoming genuinely narrow, preserving the Fard within its time takes priority over eating first.
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Disliked Acts in Prayer, Part 2: Places, Distractions, Images, and Remaining Cases
The source includes prayer in ordinary dirty or work garments when cleaner suitable clothing is available; praying bareheaded out of laziness, while genuine humility is expressly treated separately; praying when desired food is present and strongly occupies the mind; and any avoidable matter that seriously distracts the mind and damages Khushu.
If the prayer time is becoming genuinely narrow, preserving the Fard within its time takes priority over eating first.