improve hold docs

doc/how_to/performance/hold.md

@@ -1,39 +1,55 @@
-# Batching updates with `hold`
+# Batching Updates with `hold`
 
 When working with interactive dashboards and applications in Panel, you might encounter situations where updating multiple components simultaneously causes unnecessary re-renders. This is because Panel generally dispatches any change to a parameter immediately. This can lead to performance issues and a less responsive user experience because each individual update may trigger re-renders on the frontend. The `hold` utility in Panel allows you to batch updates to the frontend, reducing the number of re-renders and improving performance.
 
-In this guide, we'll explore how to use hold both as a context manager and as a decorator to optimize your Panel applications.
+In this guide, we'll explore how to use `hold` both as a context manager and as a decorator to optimize your Panel applications.
 
-## What is hold?
+## What is `hold`?
 
-The `hold` function is a context manager and decorator that temporarily holds events on a Bokeh Document. When you update multiple components within a hold block, the events are collected and dispatched all at once when the block exits. This means that the frontend will only re-render once, regardless of how many updates were made, leading to a smoother and more efficient user experience.
+The `hold` function is a context manager and decorator that temporarily holds events on a Bokeh Document. When you update multiple components within a `hold` block, the events are collected and dispatched all at once when the block exits. This means that the frontend will only re-render once, regardless of how many updates were made, leading to a smoother and more efficient user experience.
+
+Let’s try first **without `hold`** to understand the difference `hold` can make:
+
+```{pyodide}
+import panel as pn
+from panel.io import hold
+
+def increment(e):
+    for obj in column_0:
+        obj.object = str(e.new)
+
+column_0 = pn.FlexBox(*['0']*100)
+button = pn.widgets.Button(name='Increment', on_click=increment)
+
+pn.Column(column_0, button).servable()
+```
 
 ## Using `hold`
 
-### As a decorator
+### As a Decorator
 
-If you have a function that updates components and you want to ensure that all updates are held, you can use hold as a decorator. E.g. here we update 100 components at once. If you do not hold then each of these events is sent and applied in series, potentially resulting in visible updates.
+If you have a function that updates components and you want to ensure that all updates are held, you can use `hold` as a decorator. For example, here we update 100 components at once. If you do not use `hold`, each of these events is sent and applied in series, potentially resulting in visible updates.
 
 ```{pyodide}
 import panel as pn
 from panel.io import hold
 
 @hold()
 def increment(e):
-    for obj in column:
+    for obj in column_1:
         obj.object = str(e.new)
 
-column = pn.FlexBox(*['0']*100)
+column_1 = pn.FlexBox(*['0']*100)
 button = pn.widgets.Button(name='Increment', on_click=increment)
 
-pn.Column(column, button).servable()
+pn.Column(column_1, button).servable()
 ```
 
-Applying the hold decorator means all the updates are sent in a single Websocket message and applied on the frontend simultaneously.
+Applying the `hold` decorator means all the updates are sent in a single WebSocket message and applied on the frontend simultaneously.
 
-### As a context manager
+### As a Context Manager
 
-Alternatively, the `hold` function can be used as a context manager, potentially giving you finer grained control over which events are batched and which are not:
+Alternatively, the `hold` function can be used as a context manager, potentially giving you finer-grained control over which events are batched and which are not:
 
 ```{pyodide}
 import time
@@ -43,15 +59,14 @@ from panel.io import hold
 
 def increment(e):
     with button.param.update(name='Incrementing...', disabled=True):
-        time.sleep(0.5)
         with hold():
-            for obj in column:
+            for obj in column_2:
                 obj.object = str(e.new)
 
-column = pn.FlexBox(*['0']*100)
+column_2 = pn.FlexBox(*['0']*100)
 button = pn.widgets.Button(name='Increment', on_click=increment)
 
-pn.Column(column, button).servable()
+pn.Column(column_2, button).servable()
 ```
 
-Here the updates to the `Button` are dispatched immediately while the updates to the counters are batched.
+Here the updates to the `Button` are dispatched immediately, while the updates to the counters are batched.