long echo statement performance question

I'm in the process of seperating logic from display in a section of code, and wanted to make sure I wasn't treading on a performance landmine here, so I ask you wizened masters of the dark arts this... is there a serious performance hit, or reason not to use long, ie more than 30 - 40 lines, comma conjoined echo statments... echo 'blah', $var, 'blah', $var2,...ad nauseum ... to output mixed html and php var values? If so could you refer me to a work around, or better way? Frank