replace picturefill.js with lighter respimg.js and include lazysizes.js earlier
replace picturefill.js with lighter respimg.js and include lazysizes.js earlier

SlovakNationalGallery/web-umenia-2,SlovakNationalGallery/web-umenia-2,SlovakNationalGallery/web-umenia-2,SlovakNationalGallery/web-umenia-2