I want to increase my store speed can you please help me on that issues

Hey Everyone I want to increase my Store Speed how can i do that please help me it's to much slow showing on Google analytics also it loading time is too much www.avloninternational.com 

www.fonelover.com 

no it's not working sir please check i want my feature section text be black

feature collection ( White text i want black how can i do that ) 

how to add a video container in my website like  https://row.jimmychoo.com/en/homelike this slider please help me on this matterfor https://shofieewomen.com/ 

www.shofieewomen.com please check how can i fix the slider banner on this store in mobile it's fade how can i fix this issue