borland delphi /firebird server pc database slow speed not repsonding

Task#1 Borland Delphi program after data has been entered not making the program slow and not repsoding at times. Task#2 The Borland delphi program is working. . The program installed on a server with multiple client pc that acces the data with an exe icon on the desktop. using firebird server 2.0 on windows 7 machine. I would like to upgrade to latest windows version if possible... task #2 1. Borland® Developer Studio for Microsoft® Windows™ Version 10.0 - you can't use other Delphi version since it is not compatible. 2. Devrace FIBPlus 6.8.5 - db components - [login to view URL] 3. FastReport 4 components - [login to view URL] 4. DeveloperExpress components 5. Jedi VCL Delphi components (freeware) - [login to view URL] the error I reported relates to a missing file. whenopening the project source code in Delphi, and when compiling I got that error (missing TcxTreeListCellsGroupViewInfo) - That is a DevExpress control or a modifcation to a Devexpress control. This class should be included in the source files that was provided by the client, but unfortunately it is not. That means that the programmer who developed the software for the client did not send it to the client after completing the work. the exact issue here is that a source code file is missing - the functionality contained in this source file is to modify / ehnahce the original functionality in an existing component (in this case, a Devexpress grid control).