heidisql lost response and become dead when copy many sql statements into query editor

when I copy 10000 rows of sql statement into the query editor, the heidisql become inactive,and when you click the mouse on the heidisql ide,the ide has no response and become dead,and I have to restart heidisql ide.
and also,when I copy several thousands of sql statements into the editor,it takes serval seconds to show these statements in the editor,and then when i click mouse in the editor,it reponses(the cursor location appears) very very slow.
forgive my poor english.
thank you.

Yes, this is a limitation of SynEdit. You can file a bug report on the SynEdit project, but unfortunately there is not much activity there.

well,what is the relationship between heidisql and Synedit?

SynEdit is built into HeidiSQL, it's the query editing memo you see in query tabs, the sql history and on which you can customize highlighting.