why does marquee delay when an ajax response receive

[MummynSon]

I have a marquee which scrolls dynamic data in my web application, which halts a bit starts scrolling again, its like someone stops it and drags again kind of a behavior when other ajax responses receive and update data in html page. Is this a issue with marquee tag?\[code\]<marquee scrollamount="1" scrolldelay="10"> <span id="HPQ" class="syPrice">22.20</span> <span id="APQ" class="ayPrice">12.20</span> <span id="BPQ" class="byPrice">18.10</span> <span id="CPQ" class="cyPrice">65.20</span> <span id="DPQ" class="dyPrice">87.56</span> <span id="EPQ" class="eyPrice">15.24</span> <span id="FPQ" class="fyPrice">34.45</span> <span id="GPQ" class="gyPrice">16.20</span></marquee>\[/code\]and my ajax calls responses continuously updates this page as well.\[code\]function dataUpdate(){ $.ajax({ type : "GET", url : '../myJsonData.xhtml', dataType : "json", async : true, cache : false, success: function(data) { $.each(data, function(i, item) { /* updates data here */ }); setTimeout('dataUpdate()',1000); }, error : function() { } }); } \[/code\]I update the marquee data in similar manner like above ajax call