exec sp_set_session_context @key = 'SystemID', @value='A65T'
Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.
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https://www.mssqltips.com/sqlservertip/4778/performance-impact-of-sql-server-2016-rowlevel-security/
Aside that and without knowing the specs for your database(s) tables/sizes - it looks to me that the hardware used that "has 2 cores with 8 GB memory"...is very low end for running a SQL Server. I mean my old Dell 790 desktop has more hardware resources than your SQL Server so I would through this into consideration as well.