Setting spawnRadius to high values causes server-side lag spike, even if respawn point is set

The game lags significantly for a moment whenever a player dies and respawns, which makes sense. What doesn't make sense is the game lagging when said player dies, and causes the Server to lag, even if said player is near his respawn point.

What I expected to happen was...:
No lag-spike occurs.

What actually happened was...:
The game lags.

Steps to Reproduce:
1. Set gamerule spawnRadius to 16384
2. Have a player set their spawn
3. Have the player die
4. Server experiences a lagspike