RSS Feed/News Would this slow down loading?

[ENXF NET]

I need to make a change to selected nodes, like 50 something of them. Would it slow down the page loading?

extra.less

Code:

[data-template="forum_view"] {
    &[data-container-key="node-20"],
    &[data-container-key="node-22"],
    &[data-container-key="node-25"],
    &[data-container-key="node-26"],

//***** other 50 nodes here ****

&[data-container-key="node-59"],
    &[data-container-key="node-60"],
     {
        .structItem-parts>li>a:nth-child(2) {...

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