ما هي عيوب سولانا؟

Could you elaborate on the disadvantages of Solana? As a professional in the field of cryptocurrency and finance, I'm interested in understanding its limitations. Is it known to have slower transaction speeds compared to other blockchains? Also, does Solana have relatively higher transaction fees? Furthermore, I've heard about scalability issues and network congestion leading to increased transaction costs. Could you please provide insights into these challenges and any other potential disadvantages associated with Solana?