After oreo update, I noticed my TA- 1021 (India) having huge battery draining, slow performance and low camera picture quality. But low light picture for rear camera is good. Before oreo, the average memory consumption was 1.4 - 1.5 gb and now its 1.8 - 1.9. But most annoying problem is my brightness automatically fluctuating (Increasing and decreasing by itself). I tried avast antivirus, there is no virus or malware. If someone facing the same problem please report it.