very slow drawing

From: Thomas Walter (twalter@physik.unizh.ch)
Date: Fri Feb 05 1999 - 17:32:10 MET 

Dear rooters,

my root-macro executes very fast until it reaches the part,
where the postscript file is generated. The cpu-usage drops 
from about 99% to less then 3%. 

I'm using root 2.0.13, intel linux, libc 5.

Here is the critical part of the macro:


      c1->cd();
      hpad->Draw();
      tpad->Draw();
      for(t = 0; t < 50; t++) {
	tt = aH * t;
	sprintf(titleName, "Tracking %s Helix %s Thresold %d Meth %d",
                runName, SelHelix, t+thresmin, tracMeth);
	padText.SetTitle(titleName);
	tpad->cd();
	ps->NewPage();
	padText->Draw();
	for ( i = 0; i < 7; i++) {
	  hpad->cd(i+1);
	  gPad->Clear();
	  ((TH1F*)(myHs[i+tt]))->Draw("");
	}
	hpad->cd(8);
	myHt1->Draw("");
	c1->Update();
      }


What is my mistake?


Many thanks in advance

Thomas Walter

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