[bug] Memory leak on bookmap for MAC

[Roy_b]

I've noticed that bookmap is eating up my memory when I use it

how did I notice it: 

my mac get stuck, and after restarting I opened the activity monitor and also reopened bookmap with only 4 stocks tabs opened, 
in the beginning, bookmap was using about 1.3GB - 2.4GB and after half an hour it has increased to about 6GB! ram 

info about system:

mac: os Catalina ver 10.15.3 (19D76)
memory: 8 GB 2133 MHz LPDDR3
bookmap version: 7.1.1 build mac-111