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LXTerm is the official terminal for the LXDE desktop environment, which is a very light DE in itself. So LXTerminal is a very good choice for lower-end systems.
Pro Lighhtweight and ticks most boxes.
Pro Multiple tabs support
LXTerminal supports working with multiple tabs and tab-based navigation.
Pro Built-in transparency
Pro Customize-able background/foreground colors
Pro Customizable keyboard shortcuts
Con Not very customizable
LXTerminal, like XTerminal and UXTerminal, is not very customizable and extendable (at least not as much as other terminal emulators).