MediaTek just announced the Dimensity 8050 - a new chip in name only, as it's basically identical to the Dimensity 1300 and 1200.
The Dimensity 8050 is built on TSMC's N6 (6nm) process and comes with a 5G modem.
The octa-core processor has four fast Cortex-A78 cores and four efficient Cortex-A55 cores. The Cortex-A78 units are actually divided between 1 Super Core running at up to 3GHz, and three Performance Cores ticking at up to 2.6Ghz. The chipsets supports up to 16GB of LPDDR4x RAM and UFS 3.1 storage.
Arm Mali-G77 with 9 cores is in charge of graphics. The Dimensity 8050 supports 4K video capture, a maximum display resolution of 2520x1080px with a maximum refresh rate of 168hz.
The ISP supports up to 200MP cameras.
The Dimensity 8050 is already ticking inside the just announced Tecno Camon 20 Premier 5G.
How many 5G bands does Dimensity 8050 have?
Check if the problem doesn't come from eMMC storage. You can test it with "A1 SD Bench". In many case, devices that became slow have problems with storage (see it several times on eMMC)