RichEdit的内容同步更新到Image下，发现慢一个字

RichEdit的内容同步更新到Image上，发现慢一个字
我在RichEdit的Onchange事件中，有如下代码，目的是RichEdit输入什么，能同步的更新到Image上。运行以上代码以后，发现Image的显示比RichEdit上慢一些，不知如何解决了

C/C++ code

             BitBlt(Image1->Canvas->Handle,         0,0,    RichEdit1->Width,    RichEdit1->Height,    GetDC(RichEdit1->Handle),    0,0,          SRCCOPY);   ReleaseDC(RichEdit1->Handle, GetDC(RichEdit1->Handle));   Image1->Refresh();

C/C++ code

void __fastcall TForm2::RichEdit1Change(TObject *Sender){// Image1->Canvas->TextOutA(0,0,RichEdit1->Text);//RichEdit1->Refresh();  //加这一句或下面都可以 就好了RichEdit1->Repaint();BitBlt(Image1->Canvas->Handle,         0,0,    RichEdit1->Width,    RichEdit1->Height,    GetDC(RichEdit1->Handle),    0,0,          SRCCOPY);   ReleaseDC(RichEdit1->Handle, GetDC(RichEdit1->Handle));   Image1->Refresh();}
[解决办法]
你在事件中不停的GetDC和ReleaseDC，效率不高。
[解决办法]
截获RichEdit的WM_PAINT，画到Image
[解决办法]
RichEdit1Change里加这句还慢？
//RichEdit1->Refresh();  //加这一句或下面都可以 就好了
RichEdit1->Repaint();