Race Chart visualisation with many data

Anonymous you can customize the Race Chart/Run chart to make it visually demonstrative. 

Select the chart you want to customize. Access the Format tab in the Visualizations pane.

Open the Data Colors section and pick the color for your logos.

Enable the Category label option in the Data label section.

Opt for the Outside end option in the Position section.

Set the color for your labels in the Label color section.

Adjust the font size to your preference in the Label text size section.

Disable the Show title option in the Legend section.

Turn off the Show axis option for both X-axis and Y-axis sections.

Save your modifications.

Regarding your second question, there might be potential technical problems when posting your Power BI report on a big news website with lots of traffic to your Power BI iframe.

However, this depends on various factors such as the number of users accessing the report simultaneously, the complexity of the report, and the capacity of your Power BI service. You can find more information on Microsoft Learn.