Sorry, but “slow” is a relative term. We’re already 6 posts into this discussion, and you still haven’t provided any actual numbers. If you want this discussion to go anywhere, we need real measurements.
Here are a few reference points to give you an idea of what is and isn’t normal:
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On your local network, you most likely have at least a 1 Gbit/s connection to the server. That’s a theoretical maximum of 125 MB/s. In a well-optimized Nextcloud setup, using HTTP/WebDAV (which is what Nextcloud uses), you can realistically expect it maxing out at 80–100 MB/s.
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With a 150 Mbit/s connection, the theoretical maximum is 18.75 MB/s. After protocol overhead, you’ll probably see around 15 MB/s at best. So yes, it is significantly slower than on a local network.
Can it still be perfectly usable? That depends on your use case.
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Syncing documents, notes, calendars, and contacts: Yes.
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Browsing or streaming multimedia: Maybe, depending on the size and/or bitrate of the media files
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Editing documents in Collabora Office: Probably already not an ideal experience.
But again, we need numbers.
How long does it take to load the Files app? You can measure this using your browser’s developer tools (F12 → Network). 5 seconds would still be within a reasonable range. 10 seconds or more would not.
Also, what upload speed do you get when uploading a large file? If you’re only seeing 1 MB/s, there’s definitely a problem. If you’re getting 8–12 MB/s, that’s perfectly normal and about what I’d expect from a 150 Mbit/s connection.
Another factor is latency. Cable internet connections, where an upload speed of 150Mbit/s is common. often have relatively high latency.
While this shouldn’t have much impact on the actual file upload throughput, it can noticeably affect page load times and the responsiveness of editing documents in Collabora.