Putting delay until next page is loaded fully in Selenium IDE

A pragmatic approach,

If you have some visual condition that gets true just when the page is loaded, you can look for that.Say that the text "Welcome User" gets displayed in a span with id=content somewhere when the page is loaded, you can replace your waitForPageToLoad with

<tr>  <td>waitForText</td>  <td>id=content</td>  <td>Welcome*</td></tr>

Possibly you can even be as blunt as

<tr>  <td>waitForText</td>  <td>//body</td>  <td>*Welcome*</td></tr>

though I haven't tested the latter myself.

If your page reloads after clicking, you have to use clickAndWait instead of click:

<tr>    <td>clickAndWait</td>    <td>css=button.btn</td>    <td></td></tr><tr>    <td>click</td>    <td>css=span.ncs-tree-nav</td>    <td></td></tr>

If the page does not reload, upper code won't work. In this case wait for a presence of an element that you are going to use on the next step:

<tr>    <td>click</td>    <td>css=button.btn</td>    <td></td></tr><tr>    <td>waitForElementPresent</td>    <td>css=span.ncs-tree-nav</td>    <td></td></tr><tr>    <td>click</td>    <td>css=span.ncs-tree-nav</td>    <td></td></tr>