diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index 840fc62..30d5b2f 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -3,6 +3,10 @@
 ======================================
 
 
+bpo-43283: Document why printing to IDLE's Shell is often slower than
+printing to a system terminal and that it can be made faster by
+pre-formatting a single string before printing.
+
 bpo-23544: Disable Debug=>Stack Viewer when user code is running or
 Debugger is active, to prevent hang or crash.  Patch by Zackery Spytz.
 
diff --git a/Lib/idlelib/help.html b/Lib/idlelib/help.html
index 1eefa50..924042d 100644
--- a/Lib/idlelib/help.html
+++ b/Lib/idlelib/help.html
@@ -679,6 +679,14 @@
 with objects that get input from and send output to the Shell window.
 The original values stored in <code class="docutils literal notranslate"><span class="pre">sys.__stdin__</span></code>, <code class="docutils literal notranslate"><span class="pre">sys.__stdout__</span></code>, and
 <code class="docutils literal notranslate"><span class="pre">sys.__stderr__</span></code> are not touched, but may be <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
+<p>Sending print output from one process to a text widget in another is
+slower than printing to a system terminal in the same process.
+This has the most effect when printing multiple arguments, as the string
+for each argument, each separator, the newline are sent separately.
+For development, this is usually not a problem, but if one wants to
+print faster in IDLE, format and join together everything one wants
+displayed together and then print a single string.  Both format strings
+and <a class="reference internal" href="stdtypes.html#str.join" title="str.join"><code class="xref py py-meth docutils literal notranslate"><span class="pre">str.join()</span></code></a> can help combine fields and lines.</p>
 <p>IDLE’s standard stream replacements are not inherited by subprocesses
 created in the execution process, whether directly by user code or by
 modules such as multiprocessing.  If such subprocess use <code class="docutils literal notranslate"><span class="pre">input</span></code> from
@@ -982,7 +990,7 @@
 <br />
     <br />
 
-    Last updated on Feb 21, 2021.
+    Last updated on Feb 23, 2021.
     <a href="https://docs.python.org/3/bugs.html">Found a bug</a>?
     <br />