Querying An Int Column From Table That Also Stores Blob Column (Performance)

If you select an INT column from a table that also has a medium/large BLOB column (without selecting the BLOB column) will the query take longer than if the BLOB column was not there?

I am wondering if I should move the BLOB column to a separate table. Does the query duration depend mostly on the size (bytes) of a table or is it based mostly on the columns being selected?

I realize there are potentially a number of factors involved but I am asking in general terms.

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