My room is not that far away from the main router
How far? And how many barriers (walls, floors, ceilings) in between? And what is the composition of those barriers? That is, are they standard interior walls made of wallboard and wood 2 x 4s? Or concrete blocks? And are they full of metal pipes and wires? Or use metal studs?
Before buying anything, take your laptop into the same room as the router and check your performance there. If you still see performance issues, an extender will not help.
What is the model number of the router? It may be better, and much easier, to just upgrade the router.
Are there any nearby, large metal objects like refrigerators or metal file cabinets? You don't want the router or your laptop near such surfaces, or have any of those devices blocking the "line of sight" of the radio signal.
Are there any other nearby electronic devices, like TV, microwave oven, or refrigerator that may be causing
EMI/RFI?
Do you live in a crowded wifi neighborhood, like in or near a large apartment complex where there maybe many wifi networks?
What band are you using? The 5GHz band provides significantly better performance HOWEVER it is greatly limited by distance and barriers. Beyond 30 feet and more than 1 barrier and performance degrades significantly. Then you must use the 2.4GHz band. If a crowded neighborhood, changing to a different 2.4GHz channel may help. Check the router user guide for that.
Can you relocate the router, perhaps move it (or its antennas) higher up in the room? If it has moveable antennas, try reorienting them. If it has internal antennas, turn the router 90°.
If none of that helps, I would consider getting a new wifi adapter for your laptop (one with external antenna) before getting any extender. Extenders are designed to do just that, "extend" the range. They don't really improve performance unless you are already located out near the fringes of the router's range.
This one has received some good reviews, including one from a friend who really likes that it comes with a cable, giving the option to place the antenna up on a shelf, away from possible sources of EMI/RFI. His router is on one end of his house on the 2nd floor and he is able to stream videos with no problems to his laptop in a room in the basement on the other end of his house. He was not able to do this with the laptop's integrated wifi adapter.
And with an adapter, you can take it with you. Good if you visit someplace with lousy wifi.
