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IE8 image caching or error?

In my current project, I noticed that IE uses quite a lot of memory. After spending some time investigating, I found out that images are not deleted from memory, but my site uses images quite intuitively.

Finally, I created a simple test that dynamically loads images and then flushes it using jQuery

My js test:

$(document).ready(function () {
    $('#appendImages').click(append);
    $('#removeImages').click(remove);
});

function append() {
    $.post("http://localhost/TestService/GetImages", { key: $('#key').val()}, function (data) {
        $.each(data.Data.items, function (i, v) {
            $('#imagesContainer').append('<img src="' + v.imageUrl + '" />');
        }); ;
    });
}

function remove() {
    $('#imagesContainer').empty();
}

Html test:

<input id="key" type="text" value="jeans" >
<div id="reset">Reset</div>
<div id="repeatableReset">Repeatable Reset</div>
<div id="stop">Stop</div>
<br />
<br />
<br />
<br />
<div id="appendImages">append</div>
<div id="removeImages">remove</div>
<div id="imagesContainer"></div>
<html>

</html>

When new images are added, IE memory is loaded. But after deleting all downloaded images, the memory is not cleared. For example, immediately after loading a page, the IE process uses 20 MB, after adding images, it uses 35 MB, and after cleaning, 30 MB.

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$.post('ajax/test.html',
    function(data) {  
        $('.result').html(data);
});

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