[Python] How to avoid first browser new tab open delay with registered browser?

If there are no browser processes open, it will open the first window then wait 5 seconds before openning the new tab. How do I minimise the delay. Note that this problem still occurs when openning an empty tab, so it's due to delay in openning the tab rather than lag from loading the website.

import webbrowser
webbrowser.register('Thorium', None, webbrowser.Chrome(path))
Thorium = webbrowser.get('Thorium')
Thorium.open(url1)
Thorium.open_new_tab(url2)

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