Nonstop (growing) errors in inspect element

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Thanks Exitus it worked ,i removed the errors but now ,when i am clicking to change the theme ,it's slower 1 second ,i know 1 second is not that big deal but i have also messages in inspect element, 11 messages

[Intervention] Slow network is detected. See https://www.chromestatus.com/feature/5636954674692096 for more details. Fallback font will be used while loading: https://fonts.gstatic.com/s/opensans/v18...VZ0b.woff2