WaterBrushManager::AllocateRTs() create RTs in large landscape(8*8),will cost my all memory, is that right?

Development Programming & Scripting
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1 
// RTs
	UPROPERTY(VisibleAnywhere, Transient, meta = (Category = "Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> HeightmapRTA = nullptr;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> HeightmapRTB = nullptr;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> JumpFloodRTA;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> JumpFloodRTB = nullptr;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> DepthAndShapeRT = nullptr;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> WaterDepthAndVelocityRT = nullptr;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> CombinedVelocityAndHeightRTA = nullptr;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> CombinedVelocityAndHeightRTB = nullptr;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> LandscapeRTRef = nullptr;

	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> WeightmapRTA = nullptr;
	
	UPROPERTY(VisibleAnywhere, Transient, meta=(Category="Render Targets"))
	TObjectPtr<UTextureRenderTarget2D> WeightmapRTB = nullptr;

these RTs 8192*8192 is so large, Is there any way to avoid this?