The issue appears to have been fixed with MS15-056: Cumulative security update for Internet Explorer: June 9, 2015 (KB3058515).
Included in the list of "Non-security-related fixes that are included in this security update" is HTML table content renders slowly in Internet Explorer (KB3066267) which has confirmed that this is a problem after installation of KB3038314 or KB3049563.
Regards,
Shoaib.