Reproject of rasters loads the raster to memory about telluric HOT 3 CLOSED

with rasterio.Env(**rasterio_ops):
    with rasterio.open('/home/juanlu/Development/rasterio/tests/data/RGB.byte.tif') as src:
        transform, width, height = calculate_default_transform(
        src.crs, dst_crs, src.width, src.height, *src.bounds)
        kwargs = src.meta.copy()
        kwargs.update({
            'crs': dst_crs,
            'transform': transform,
            'width': width,
            'height': height
        })
        with rasterio.MemoryFile() as memfile:
            with memfile.open(**kwargs) as dst:
                for i in range(1, src.count + 1):
                    reproject(
                        source=rasterio.band(src, i),
                        destination=rasterio.band(dst, i),
                        src_transform=src.transform,
                        src_crs=src.crs,
                        dst_transform=transform,
                        dst_crs=dst_crs,
                        resampling=Resampling.nearest)