Jack Dorsey-led payments firm Block announced on Thursday that it will significantly slow down its pace of hiring in 2023 to control costs.The company plans to grow its headcount by only 10% this year, a sharp slowdown from the 46% growth it achieved in 2022.Despite the slowdown in hiring, Block's gross profit jumped over 40% YoY in Q4, leading to an 8% jump in its shares in extended trading.