I successfully remove the shipping estimation in Magento 2 cart page summary using this solution:
<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceBlock name="checkout.cart.shipping">
<arguments>
<argument name="jsLayout" xsi:type="array">
<item name="components" xsi:type="array">
<item name="block-summary" xsi:type="array">
<item name="config" xsi:type="array">
<item name="componentDisabled" xsi:type="boolean">true</item>
</item>
</item>
</item>
</argument>
</arguments>
</referenceBlock>
</body>
</page>
when the page first load in cart page summary, the order total will take some time to display, but there is no loader that indicates the order summary is being loaded