javax.swing.text.html.parser.Parser parseScript incorrectly optimized

FULL PRODUCT VERSION :
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]


A DESCRIPTION OF THE PROBLEM :
Parsing an HTML-page containing large scripts (with comments) is painfully slow after updating to Java 8.

Parsing a page that took <1s before now takes >5minutes!

Looking at the difference between Jav 7 and Java 8 versions the culprit is most likely the "optimization" added. (Adding 'insideComment' and keeping it up to date by repeatedly copying the whole string looks like a *very* bad idea).

REGRESSION. Last worked in version 7u80

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Code inspection should be enought to see that this is an issue.

But otherwise prepare a Parser.parse request targeting for example http://site.soccer.betfair.com/Menu.do?timeZone=Europe/Stockholm&region=GBR&brand=betfair&locale=sv


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The HTML being parsed in a few seconds.
ACTUAL -
The HTML being parsed, but you have to get a cup of coffee before it is done (5-7 minutes on my machine).

REPRODUCIBILITY :
This bug can be reproduced always.