Delaying Autostart

I have a Raspberry Pi 5 running the latest version of Bookworm and using Labwc as the GUI.
I have Grafana displaying the Internet Speed installed as here.
https://dev.to/benji377/grafana-speed-monitor-setting-up-an-internet-monitor-with-raspberry-pi-50jk
I boot straight into Grafana using Kiosk mode by editing the /etc/xdg/labwc/autostart file and adding this line to the end
chromium = /usr/bin/chromium-browser --start-fullscreen --start-maximized --kiosk --hide-scrollbars --noerrdialogs --disable-default-apps --disable-single-click-autofill --disable-translate-new-ux --disable-translate --disable-cache --disk-cache-dir=/dev/null --disk-cache-size=1 --reduce-security-for-testing --app=http:///127.0.0.1:3030&kiosk
This works perfectly - however when I first boot Grafana takes a little while to start up and for the first minute or so I get a "Site Not Found Page" which eventually clears and Grafana is shown.
No biggy but looks a little messy!
Is there anyway to put a pause in the autostart sequence to allow Grafana to load??