About the loading speed of themes purchased on themeforest

the demo site loading speed of this theme on themeforest https://demo.casethemes.net/consultio-tax/
is not good will it be same on the live sites

It loads fairly quickly for us?

Ultimately the demo is always going to be a more bloated version of the the was it’s showing off everything on offer

If you invest in decent hosting, then most themes should be quick. If you go with budget shared hosting from a mass supplier, don’t optimise assets, minify code and generally work to optimise the website then it won’t matter what theme you are using - it will struggle