Poor performance from Pages on static assets

Hello, I am using SvelteKit with the cloudflare-adapter to deploy to Pages. I'm seeing what looks like consistent poor performance from the /_app dir which is excluded in _routes.json:
{
        "version": 1,
        "description": "Generated by @sveltejs/adapter-cloudflare",
        "include": [
                "/*"
        ],
        "exclude": [
                "/_app/*",
                "/static/*"
        ]
}

I keep seeing over 600ms server response time for a 1.0 kB file, and in the worst case 2.76 seconds (see attached screenshot). Is this to be expected on the free plan in Asia/Tokyo?
Screenshot_2023-11-20_at_12.42.54.png
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