What intelligent functions does this switch support to help manage the network?

It supports four intelligent functions: priority, EEE, port isolation, and static trunk.

Can I use standard CAT5e Ethernet cables with this switch to get 2.5G performance?

Yes. The product description says it can seamlessly upgrade to 2.5G by using standard CAT5e Ethernet cables.

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Asus QG-U1050 Ethernet Switch - TAA compliant - 5 Ports - 2.5 Gigabit Ethernet - 2.5GBase-T, 100Base-TX - 2 Layer Supported - Twisted Pair - White

Upgraded 2.5G ports - Seamlessly upgrade to 2.5G by using standard CAT5e Ethernet cables to enjoy faster network performance.
Support four intelligent functions - priority, EEE, port isolation, and static trunk. One switch is all you need to safeguard and optimize your home or business network.
Plug and Play, Effortless Setup - Setting up your network has never been easier! Simply connect your devices, and you’re good to go—no complicated configurations required.
Versatile Networking Expansion - You can connect 2.5G-compatible devices, including NAS , AP, Gaming PCs, and 4K streaming devices to achieve a more comprehensive network setup.