Players most commonly report seeing an increase in lag on their home islands and on more established saves. Lag has also been reported when traveling from island to island, especially as the island the player is approaching begins to load in.
One of the common factors in saves where players report this occurring is a significant amount of gathered resources on the home island. Reducing the number of loose items may help towards a reduction in lag.
If you find the lag when traveling occurs when traveling only to a particular type of island or around a specific object, please let us know in the comments below.
If you find lag or performance drops are occurring for you and your situation does not match those listed above, please create a new post in the main Bug Reports section.