Chroma Hills HD comes in 128x and 64x resolutions. While both demand more memory than standard texture packs, using the 64x version can help improve performance (lag, crashing) on devices with lower available RAM memory like phones, tablets and other mobile devices including the Nintendo Switch.
To change the resolution:
Activate the resource pack for a world and then select the settings for the pack by selecting the gear icon (to the left of the green check mark). Click on the left side of the bar to change the resolution to 64x.