Journey from Crypto to Stocks

Long story short I did crypto for almost 2 years and now completely switched to PSX and it is a nightmare. I am using JS invest pro I'm facing a ton of problems App doesn't load up quick, it takes minutes to load up a stock page. I'm not able to buy any stock, most of the times it gets rejected by some trader. Is this some liquidity problem with stock exchange? I never faced suck things in crypto, i could buy or sell anything within seconds but in here it feels like i'm back to some 90's era