Ranked against every country we've compared Luxembourg to, highest compatibility first.
“Two nations united by paperwork, divided by whether that paperwork was designed by a Swiss-trained compliance officer or inherited from a dissolved empire — compatibility is achievable, but only if both parties agree to wait.”
Both cultures appear to regard the concept of urgency as mildly impolite, which is either deep philosophical alignment or two people agreeing to miss the same deadlines.
Luxembourg processes you like a minor dignitary; Slovakia processes you like a numbered ticket — different registers of formality, but formality nonetheless.
Luxembourg communicates with hushed, engineered precision; Slovakia communicates primarily through unstamped silences and the eventual materialisation of a document nobody mentioned was required.
Both countries will take exactly as long as they take, and neither will apologise — the difference is that Luxembourg's delay comes in an elegant envelope.
Shared suffering at government counters creates a certain camaraderie, though Luxembourg prefers to suffer in a leather chair and Slovakia in a plastic one.